libcxx/test/std/language.support/support.limits/support.limits.general/version.version.pass.cpp

//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// WARNING: This test was generated by generate_feature_test_macro_components.py
// and should not be edited manually.

// <version>

// Test the feature test macros defined by <version>

/*  Constant                                       Value
    __cpp_lib_addressof_constexpr                  201603L [C++17]
    __cpp_lib_allocator_traits_is_always_equal     201411L [C++17]
    __cpp_lib_any                                  201606L [C++17]
    __cpp_lib_apply                                201603L [C++17]
    __cpp_lib_array_constexpr                      201603L [C++17]
    __cpp_lib_as_const                             201510L [C++17]
    __cpp_lib_atomic_is_always_lock_free           201603L [C++17]
    __cpp_lib_atomic_ref                           201806L [C++2a]
    __cpp_lib_bind_front                           201811L [C++2a]
    __cpp_lib_bit_cast                             201806L [C++2a]
    __cpp_lib_bool_constant                        201505L [C++17]
    __cpp_lib_boyer_moore_searcher                 201603L [C++17]
    __cpp_lib_byte                                 201603L [C++17]
    __cpp_lib_char8_t                              201811L [C++2a]
    __cpp_lib_chrono                               201611L [C++17]
    __cpp_lib_chrono_udls                          201304L [C++14]
    __cpp_lib_clamp                                201603L [C++17]
    __cpp_lib_complex_udls                         201309L [C++14]
    __cpp_lib_concepts                             201806L [C++2a]
    __cpp_lib_constexpr_misc                       201811L [C++2a]
    __cpp_lib_constexpr_swap_algorithms            201806L [C++2a]
    __cpp_lib_destroying_delete                    201806L [C++2a]
    __cpp_lib_enable_shared_from_this              201603L [C++17]
    __cpp_lib_erase_if                             201811L [C++2a]
    __cpp_lib_exchange_function                    201304L [C++14]
    __cpp_lib_execution                            201603L [C++17]
    __cpp_lib_filesystem                           201703L [C++17]
    __cpp_lib_gcd_lcm                              201606L [C++17]
    __cpp_lib_generic_associative_lookup           201304L [C++14]
    __cpp_lib_generic_unordered_lookup             201811L [C++2a]
    __cpp_lib_hardware_interference_size           201703L [C++17]
    __cpp_lib_has_unique_object_representations    201606L [C++17]
    __cpp_lib_hypot                                201603L [C++17]
    __cpp_lib_incomplete_container_elements        201505L [C++17]
    __cpp_lib_integer_sequence                     201304L [C++14]
    __cpp_lib_integral_constant_callable           201304L [C++14]
    __cpp_lib_interpolate                          201902L [C++2a]
    __cpp_lib_invoke                               201411L [C++17]
    __cpp_lib_is_aggregate                         201703L [C++17]
    __cpp_lib_is_constant_evaluated                201811L [C++2a]
    __cpp_lib_is_final                             201402L [C++14]
    __cpp_lib_is_invocable                         201703L [C++17]
    __cpp_lib_is_null_pointer                      201309L [C++14]
    __cpp_lib_is_swappable                         201603L [C++17]
    __cpp_lib_launder                              201606L [C++17]
    __cpp_lib_list_remove_return_type              201806L [C++2a]
    __cpp_lib_logical_traits                       201510L [C++17]
    __cpp_lib_make_from_tuple                      201606L [C++17]
    __cpp_lib_make_reverse_iterator                201402L [C++14]
    __cpp_lib_make_unique                          201304L [C++14]
    __cpp_lib_map_try_emplace                      201411L [C++17]
    __cpp_lib_math_special_functions               201603L [C++17]
    __cpp_lib_memory_resource                      201603L [C++17]
    __cpp_lib_node_extract                         201606L [C++17]
    __cpp_lib_nonmember_container_access           201411L [C++17]
    __cpp_lib_not_fn                               201603L [C++17]
    __cpp_lib_null_iterators                       201304L [C++14]
    __cpp_lib_optional                             201606L [C++17]
    __cpp_lib_parallel_algorithm                   201603L [C++17]
    __cpp_lib_quoted_string_io                     201304L [C++14]
    __cpp_lib_ranges                               201811L [C++2a]
    __cpp_lib_raw_memory_algorithms                201606L [C++17]
    __cpp_lib_result_of_sfinae                     201210L [C++14]
    __cpp_lib_robust_nonmodifying_seq_ops          201304L [C++14]
    __cpp_lib_sample                               201603L [C++17]
    __cpp_lib_scoped_lock                          201703L [C++17]
    __cpp_lib_shared_mutex                         201505L [C++17]
    __cpp_lib_shared_ptr_arrays                    201611L [C++17]
    __cpp_lib_shared_ptr_weak_type                 201606L [C++17]
    __cpp_lib_shared_timed_mutex                   201402L [C++14]
    __cpp_lib_string_udls                          201304L [C++14]
    __cpp_lib_string_view                          201606L [C++17]
    __cpp_lib_three_way_comparison                 201711L [C++2a]
    __cpp_lib_to_chars                             201611L [C++17]
    __cpp_lib_transformation_trait_aliases         201304L [C++14]
    __cpp_lib_transparent_operators                201210L [C++14]
                                                   201510L [C++17]
    __cpp_lib_tuple_element_t                      201402L [C++14]
    __cpp_lib_tuples_by_type                       201304L [C++14]
    __cpp_lib_type_trait_variable_templates        201510L [C++17]
    __cpp_lib_uncaught_exceptions                  201411L [C++17]
    __cpp_lib_unordered_map_try_emplace            201411L [C++17]
    __cpp_lib_variant                              201606L [C++17]
    __cpp_lib_void_t                               201411L [C++17]
*/

#include <version>
#include "test_macros.h"

#if TEST_STD_VER < 14

# ifdef __cpp_lib_addressof_constexpr
#   error "__cpp_lib_addressof_constexpr should not be defined before c++17"
# endif

# ifdef __cpp_lib_allocator_traits_is_always_equal
#   error "__cpp_lib_allocator_traits_is_always_equal should not be defined before c++17"
# endif

# ifdef __cpp_lib_any
#   error "__cpp_lib_any should not be defined before c++17"
# endif

# ifdef __cpp_lib_apply
#   error "__cpp_lib_apply should not be defined before c++17"
# endif

# ifdef __cpp_lib_array_constexpr
#   error "__cpp_lib_array_constexpr should not be defined before c++17"
# endif

# ifdef __cpp_lib_as_const
#   error "__cpp_lib_as_const should not be defined before c++17"
# endif

# ifdef __cpp_lib_atomic_is_always_lock_free
#   error "__cpp_lib_atomic_is_always_lock_free should not be defined before c++17"
# endif

# ifdef __cpp_lib_atomic_ref
#   error "__cpp_lib_atomic_ref should not be defined before c++2a"
# endif

# ifdef __cpp_lib_bind_front
#   error "__cpp_lib_bind_front should not be defined before c++2a"
# endif

# ifdef __cpp_lib_bit_cast
#   error "__cpp_lib_bit_cast should not be defined before c++2a"
# endif

# ifdef __cpp_lib_bool_constant
#   error "__cpp_lib_bool_constant should not be defined before c++17"
# endif

# ifdef __cpp_lib_boyer_moore_searcher
#   error "__cpp_lib_boyer_moore_searcher should not be defined before c++17"
# endif

# ifdef __cpp_lib_byte
#   error "__cpp_lib_byte should not be defined before c++17"
# endif

# ifdef __cpp_lib_char8_t
#   error "__cpp_lib_char8_t should not be defined before c++2a"
# endif

# ifdef __cpp_lib_chrono
#   error "__cpp_lib_chrono should not be defined before c++17"
# endif

# ifdef __cpp_lib_chrono_udls
#   error "__cpp_lib_chrono_udls should not be defined before c++14"
# endif

# ifdef __cpp_lib_clamp
#   error "__cpp_lib_clamp should not be defined before c++17"
# endif

# ifdef __cpp_lib_complex_udls
#   error "__cpp_lib_complex_udls should not be defined before c++14"
# endif

# ifdef __cpp_lib_concepts
#   error "__cpp_lib_concepts should not be defined before c++2a"
# endif

# ifdef __cpp_lib_constexpr_misc
#   error "__cpp_lib_constexpr_misc should not be defined before c++2a"
# endif

# ifdef __cpp_lib_constexpr_swap_algorithms
#   error "__cpp_lib_constexpr_swap_algorithms should not be defined before c++2a"
# endif

# ifdef __cpp_lib_destroying_delete
#   error "__cpp_lib_destroying_delete should not be defined before c++2a"
# endif

# ifdef __cpp_lib_enable_shared_from_this
#   error "__cpp_lib_enable_shared_from_this should not be defined before c++17"
# endif

# ifdef __cpp_lib_erase_if
#   error "__cpp_lib_erase_if should not be defined before c++2a"
# endif

# ifdef __cpp_lib_exchange_function
#   error "__cpp_lib_exchange_function should not be defined before c++14"
# endif

# ifdef __cpp_lib_execution
#   error "__cpp_lib_execution should not be defined before c++17"
# endif

# ifdef __cpp_lib_filesystem
#   error "__cpp_lib_filesystem should not be defined before c++17"
# endif

# ifdef __cpp_lib_gcd_lcm
#   error "__cpp_lib_gcd_lcm should not be defined before c++17"
# endif

# ifdef __cpp_lib_generic_associative_lookup
#   error "__cpp_lib_generic_associative_lookup should not be defined before c++14"
# endif

# ifdef __cpp_lib_generic_unordered_lookup
#   error "__cpp_lib_generic_unordered_lookup should not be defined before c++2a"
# endif

# ifdef __cpp_lib_hardware_interference_size
#   error "__cpp_lib_hardware_interference_size should not be defined before c++17"
# endif

# ifdef __cpp_lib_has_unique_object_representations
#   error "__cpp_lib_has_unique_object_representations should not be defined before c++17"
# endif

# ifdef __cpp_lib_hypot
#   error "__cpp_lib_hypot should not be defined before c++17"
# endif

# ifdef __cpp_lib_incomplete_container_elements
#   error "__cpp_lib_incomplete_container_elements should not be defined before c++17"
# endif

# ifdef __cpp_lib_integer_sequence
#   error "__cpp_lib_integer_sequence should not be defined before c++14"
# endif

# ifdef __cpp_lib_integral_constant_callable
#   error "__cpp_lib_integral_constant_callable should not be defined before c++14"
# endif

# ifdef __cpp_lib_interpolate
#   error "__cpp_lib_interpolate should not be defined before c++2a"
# endif

# ifdef __cpp_lib_invoke
#   error "__cpp_lib_invoke should not be defined before c++17"
# endif

# ifdef __cpp_lib_is_aggregate
#   error "__cpp_lib_is_aggregate should not be defined before c++17"
# endif

# ifdef __cpp_lib_is_constant_evaluated
#   error "__cpp_lib_is_constant_evaluated should not be defined before c++2a"
# endif

# ifdef __cpp_lib_is_final
#   error "__cpp_lib_is_final should not be defined before c++14"
# endif

# ifdef __cpp_lib_is_invocable
#   error "__cpp_lib_is_invocable should not be defined before c++17"
# endif

# ifdef __cpp_lib_is_null_pointer
#   error "__cpp_lib_is_null_pointer should not be defined before c++14"
# endif

# ifdef __cpp_lib_is_swappable
#   error "__cpp_lib_is_swappable should not be defined before c++17"
# endif

# ifdef __cpp_lib_launder
#   error "__cpp_lib_launder should not be defined before c++17"
# endif

# ifdef __cpp_lib_list_remove_return_type
#   error "__cpp_lib_list_remove_return_type should not be defined before c++2a"
# endif

# ifdef __cpp_lib_logical_traits
#   error "__cpp_lib_logical_traits should not be defined before c++17"
# endif

# ifdef __cpp_lib_make_from_tuple
#   error "__cpp_lib_make_from_tuple should not be defined before c++17"
# endif

# ifdef __cpp_lib_make_reverse_iterator
#   error "__cpp_lib_make_reverse_iterator should not be defined before c++14"
# endif

# ifdef __cpp_lib_make_unique
#   error "__cpp_lib_make_unique should not be defined before c++14"
# endif

# ifdef __cpp_lib_map_try_emplace
#   error "__cpp_lib_map_try_emplace should not be defined before c++17"
# endif

# ifdef __cpp_lib_math_special_functions
#   error "__cpp_lib_math_special_functions should not be defined before c++17"
# endif

# ifdef __cpp_lib_memory_resource
#   error "__cpp_lib_memory_resource should not be defined before c++17"
# endif

# ifdef __cpp_lib_node_extract
#   error "__cpp_lib_node_extract should not be defined before c++17"
# endif

# ifdef __cpp_lib_nonmember_container_access
#   error "__cpp_lib_nonmember_container_access should not be defined before c++17"
# endif

# ifdef __cpp_lib_not_fn
#   error "__cpp_lib_not_fn should not be defined before c++17"
# endif

# ifdef __cpp_lib_null_iterators
#   error "__cpp_lib_null_iterators should not be defined before c++14"
# endif

# ifdef __cpp_lib_optional
#   error "__cpp_lib_optional should not be defined before c++17"
# endif

# ifdef __cpp_lib_parallel_algorithm
#   error "__cpp_lib_parallel_algorithm should not be defined before c++17"
# endif

# ifdef __cpp_lib_quoted_string_io
#   error "__cpp_lib_quoted_string_io should not be defined before c++14"
# endif

# ifdef __cpp_lib_ranges
#   error "__cpp_lib_ranges should not be defined before c++2a"
# endif

# ifdef __cpp_lib_raw_memory_algorithms
#   error "__cpp_lib_raw_memory_algorithms should not be defined before c++17"
# endif

# ifdef __cpp_lib_result_of_sfinae
#   error "__cpp_lib_result_of_sfinae should not be defined before c++14"
# endif

# ifdef __cpp_lib_robust_nonmodifying_seq_ops
#   error "__cpp_lib_robust_nonmodifying_seq_ops should not be defined before c++14"
# endif

# ifdef __cpp_lib_sample
#   error "__cpp_lib_sample should not be defined before c++17"
# endif

# ifdef __cpp_lib_scoped_lock
#   error "__cpp_lib_scoped_lock should not be defined before c++17"
# endif

# ifdef __cpp_lib_shared_mutex
#   error "__cpp_lib_shared_mutex should not be defined before c++17"
# endif

# ifdef __cpp_lib_shared_ptr_arrays
#   error "__cpp_lib_shared_ptr_arrays should not be defined before c++17"
# endif

# ifdef __cpp_lib_shared_ptr_weak_type
#   error "__cpp_lib_shared_ptr_weak_type should not be defined before c++17"
# endif

# ifdef __cpp_lib_shared_timed_mutex
#   error "__cpp_lib_shared_timed_mutex should not be defined before c++14"
# endif

# ifdef __cpp_lib_string_udls
#   error "__cpp_lib_string_udls should not be defined before c++14"
# endif

# ifdef __cpp_lib_string_view
#   error "__cpp_lib_string_view should not be defined before c++17"
# endif

# ifdef __cpp_lib_three_way_comparison
#   error "__cpp_lib_three_way_comparison should not be defined before c++2a"
# endif

# ifdef __cpp_lib_to_chars
#   error "__cpp_lib_to_chars should not be defined before c++17"
# endif

# ifdef __cpp_lib_transformation_trait_aliases
#   error "__cpp_lib_transformation_trait_aliases should not be defined before c++14"
# endif

# ifdef __cpp_lib_transparent_operators
#   error "__cpp_lib_transparent_operators should not be defined before c++14"
# endif

# ifdef __cpp_lib_tuple_element_t
#   error "__cpp_lib_tuple_element_t should not be defined before c++14"
# endif

# ifdef __cpp_lib_tuples_by_type
#   error "__cpp_lib_tuples_by_type should not be defined before c++14"
# endif

# ifdef __cpp_lib_type_trait_variable_templates
#   error "__cpp_lib_type_trait_variable_templates should not be defined before c++17"
# endif

# ifdef __cpp_lib_uncaught_exceptions
#   error "__cpp_lib_uncaught_exceptions should not be defined before c++17"
# endif

# ifdef __cpp_lib_unordered_map_try_emplace
#   error "__cpp_lib_unordered_map_try_emplace should not be defined before c++17"
# endif

# ifdef __cpp_lib_variant
#   error "__cpp_lib_variant should not be defined before c++17"
# endif

# ifdef __cpp_lib_void_t
#   error "__cpp_lib_void_t should not be defined before c++17"
# endif

#elif TEST_STD_VER == 14

# ifdef __cpp_lib_addressof_constexpr
#   error "__cpp_lib_addressof_constexpr should not be defined before c++17"
# endif

# ifdef __cpp_lib_allocator_traits_is_always_equal
#   error "__cpp_lib_allocator_traits_is_always_equal should not be defined before c++17"
# endif

# ifdef __cpp_lib_any
#   error "__cpp_lib_any should not be defined before c++17"
# endif

# ifdef __cpp_lib_apply
#   error "__cpp_lib_apply should not be defined before c++17"
# endif

# ifdef __cpp_lib_array_constexpr
#   error "__cpp_lib_array_constexpr should not be defined before c++17"
# endif

# ifdef __cpp_lib_as_const
#   error "__cpp_lib_as_const should not be defined before c++17"
# endif

# ifdef __cpp_lib_atomic_is_always_lock_free
#   error "__cpp_lib_atomic_is_always_lock_free should not be defined before c++17"
# endif

# ifdef __cpp_lib_atomic_ref
#   error "__cpp_lib_atomic_ref should not be defined before c++2a"
# endif

# ifdef __cpp_lib_bind_front
#   error "__cpp_lib_bind_front should not be defined before c++2a"
# endif

# ifdef __cpp_lib_bit_cast
#   error "__cpp_lib_bit_cast should not be defined before c++2a"
# endif

# ifdef __cpp_lib_bool_constant
#   error "__cpp_lib_bool_constant should not be defined before c++17"
# endif

# ifdef __cpp_lib_boyer_moore_searcher
#   error "__cpp_lib_boyer_moore_searcher should not be defined before c++17"
# endif

# ifdef __cpp_lib_byte
#   error "__cpp_lib_byte should not be defined before c++17"
# endif

# ifdef __cpp_lib_char8_t
#   error "__cpp_lib_char8_t should not be defined before c++2a"
# endif

# ifdef __cpp_lib_chrono
#   error "__cpp_lib_chrono should not be defined before c++17"
# endif

# ifndef __cpp_lib_chrono_udls
#   error "__cpp_lib_chrono_udls should be defined in c++14"
# endif
# if __cpp_lib_chrono_udls != 201304L
#   error "__cpp_lib_chrono_udls should have the value 201304L in c++14"
# endif

# ifdef __cpp_lib_clamp
#   error "__cpp_lib_clamp should not be defined before c++17"
# endif

# ifndef __cpp_lib_complex_udls
#   error "__cpp_lib_complex_udls should be defined in c++14"
# endif
# if __cpp_lib_complex_udls != 201309L
#   error "__cpp_lib_complex_udls should have the value 201309L in c++14"
# endif

# ifdef __cpp_lib_concepts
#   error "__cpp_lib_concepts should not be defined before c++2a"
# endif

# ifdef __cpp_lib_constexpr_misc
#   error "__cpp_lib_constexpr_misc should not be defined before c++2a"
# endif

# ifdef __cpp_lib_constexpr_swap_algorithms
#   error "__cpp_lib_constexpr_swap_algorithms should not be defined before c++2a"
# endif

# ifdef __cpp_lib_destroying_delete
#   error "__cpp_lib_destroying_delete should not be defined before c++2a"
# endif

# ifdef __cpp_lib_enable_shared_from_this
#   error "__cpp_lib_enable_shared_from_this should not be defined before c++17"
# endif

# ifdef __cpp_lib_erase_if
#   error "__cpp_lib_erase_if should not be defined before c++2a"
# endif

# ifndef __cpp_lib_exchange_function
#   error "__cpp_lib_exchange_function should be defined in c++14"
# endif
# if __cpp_lib_exchange_function != 201304L
#   error "__cpp_lib_exchange_function should have the value 201304L in c++14"
# endif

# ifdef __cpp_lib_execution
#   error "__cpp_lib_execution should not be defined before c++17"
# endif

# ifdef __cpp_lib_filesystem
#   error "__cpp_lib_filesystem should not be defined before c++17"
# endif

# ifdef __cpp_lib_gcd_lcm
#   error "__cpp_lib_gcd_lcm should not be defined before c++17"
# endif

# ifndef __cpp_lib_generic_associative_lookup
#   error "__cpp_lib_generic_associative_lookup should be defined in c++14"
# endif
# if __cpp_lib_generic_associative_lookup != 201304L
#   error "__cpp_lib_generic_associative_lookup should have the value 201304L in c++14"
# endif

# ifdef __cpp_lib_generic_unordered_lookup
#   error "__cpp_lib_generic_unordered_lookup should not be defined before c++2a"
# endif

# ifdef __cpp_lib_hardware_interference_size
#   error "__cpp_lib_hardware_interference_size should not be defined before c++17"
# endif

# ifdef __cpp_lib_has_unique_object_representations
#   error "__cpp_lib_has_unique_object_representations should not be defined before c++17"
# endif

# ifdef __cpp_lib_hypot
#   error "__cpp_lib_hypot should not be defined before c++17"
# endif

# ifdef __cpp_lib_incomplete_container_elements
#   error "__cpp_lib_incomplete_container_elements should not be defined before c++17"
# endif

# ifndef __cpp_lib_integer_sequence
#   error "__cpp_lib_integer_sequence should be defined in c++14"
# endif
# if __cpp_lib_integer_sequence != 201304L
#   error "__cpp_lib_integer_sequence should have the value 201304L in c++14"
# endif

# ifndef __cpp_lib_integral_constant_callable
#   error "__cpp_lib_integral_constant_callable should be defined in c++14"
# endif
# if __cpp_lib_integral_constant_callable != 201304L
#   error "__cpp_lib_integral_constant_callable should have the value 201304L in c++14"
# endif

# ifdef __cpp_lib_interpolate
#   error "__cpp_lib_interpolate should not be defined before c++2a"
# endif

# ifdef __cpp_lib_invoke
#   error "__cpp_lib_invoke should not be defined before c++17"
# endif

# ifdef __cpp_lib_is_aggregate
#   error "__cpp_lib_is_aggregate should not be defined before c++17"
# endif

# ifdef __cpp_lib_is_constant_evaluated
#   error "__cpp_lib_is_constant_evaluated should not be defined before c++2a"
# endif

# ifndef __cpp_lib_is_final
#   error "__cpp_lib_is_final should be defined in c++14"
# endif
# if __cpp_lib_is_final != 201402L
#   error "__cpp_lib_is_final should have the value 201402L in c++14"
# endif

# ifdef __cpp_lib_is_invocable
#   error "__cpp_lib_is_invocable should not be defined before c++17"
# endif

# ifndef __cpp_lib_is_null_pointer
#   error "__cpp_lib_is_null_pointer should be defined in c++14"
# endif
# if __cpp_lib_is_null_pointer != 201309L
#   error "__cpp_lib_is_null_pointer should have the value 201309L in c++14"
# endif

# ifdef __cpp_lib_is_swappable
#   error "__cpp_lib_is_swappable should not be defined before c++17"
# endif

# ifdef __cpp_lib_launder
#   error "__cpp_lib_launder should not be defined before c++17"
# endif

# ifdef __cpp_lib_list_remove_return_type
#   error "__cpp_lib_list_remove_return_type should not be defined before c++2a"
# endif

# ifdef __cpp_lib_logical_traits
#   error "__cpp_lib_logical_traits should not be defined before c++17"
# endif

# ifdef __cpp_lib_make_from_tuple
#   error "__cpp_lib_make_from_tuple should not be defined before c++17"
# endif

# ifndef __cpp_lib_make_reverse_iterator
#   error "__cpp_lib_make_reverse_iterator should be defined in c++14"
# endif
# if __cpp_lib_make_reverse_iterator != 201402L
#   error "__cpp_lib_make_reverse_iterator should have the value 201402L in c++14"
# endif

# ifndef __cpp_lib_make_unique
#   error "__cpp_lib_make_unique should be defined in c++14"
# endif
# if __cpp_lib_make_unique != 201304L
#   error "__cpp_lib_make_unique should have the value 201304L in c++14"
# endif

# ifdef __cpp_lib_map_try_emplace
#   error "__cpp_lib_map_try_emplace should not be defined before c++17"
# endif

# ifdef __cpp_lib_math_special_functions
#   error "__cpp_lib_math_special_functions should not be defined before c++17"
# endif

# ifdef __cpp_lib_memory_resource
#   error "__cpp_lib_memory_resource should not be defined before c++17"
# endif

# ifdef __cpp_lib_node_extract
#   error "__cpp_lib_node_extract should not be defined before c++17"
# endif

# ifdef __cpp_lib_nonmember_container_access
#   error "__cpp_lib_nonmember_container_access should not be defined before c++17"
# endif

# ifdef __cpp_lib_not_fn
#   error "__cpp_lib_not_fn should not be defined before c++17"
# endif

# ifndef __cpp_lib_null_iterators
#   error "__cpp_lib_null_iterators should be defined in c++14"
# endif
# if __cpp_lib_null_iterators != 201304L
#   error "__cpp_lib_null_iterators should have the value 201304L in c++14"
# endif

# ifdef __cpp_lib_optional
#   error "__cpp_lib_optional should not be defined before c++17"
# endif

# ifdef __cpp_lib_parallel_algorithm
#   error "__cpp_lib_parallel_algorithm should not be defined before c++17"
# endif

# ifndef __cpp_lib_quoted_string_io
#   error "__cpp_lib_quoted_string_io should be defined in c++14"
# endif
# if __cpp_lib_quoted_string_io != 201304L
#   error "__cpp_lib_quoted_string_io should have the value 201304L in c++14"
# endif

# ifdef __cpp_lib_ranges
#   error "__cpp_lib_ranges should not be defined before c++2a"
# endif

# ifdef __cpp_lib_raw_memory_algorithms
#   error "__cpp_lib_raw_memory_algorithms should not be defined before c++17"
# endif

# ifndef __cpp_lib_result_of_sfinae
#   error "__cpp_lib_result_of_sfinae should be defined in c++14"
# endif
# if __cpp_lib_result_of_sfinae != 201210L
#   error "__cpp_lib_result_of_sfinae should have the value 201210L in c++14"
# endif

# ifndef __cpp_lib_robust_nonmodifying_seq_ops
#   error "__cpp_lib_robust_nonmodifying_seq_ops should be defined in c++14"
# endif
# if __cpp_lib_robust_nonmodifying_seq_ops != 201304L
#   error "__cpp_lib_robust_nonmodifying_seq_ops should have the value 201304L in c++14"
# endif

# ifdef __cpp_lib_sample
#   error "__cpp_lib_sample should not be defined before c++17"
# endif

# ifdef __cpp_lib_scoped_lock
#   error "__cpp_lib_scoped_lock should not be defined before c++17"
# endif

# ifdef __cpp_lib_shared_mutex
#   error "__cpp_lib_shared_mutex should not be defined before c++17"
# endif

# ifdef __cpp_lib_shared_ptr_arrays
#   error "__cpp_lib_shared_ptr_arrays should not be defined before c++17"
# endif

# ifdef __cpp_lib_shared_ptr_weak_type
#   error "__cpp_lib_shared_ptr_weak_type should not be defined before c++17"
# endif

# if !defined(_LIBCPP_HAS_NO_THREADS)
#   ifndef __cpp_lib_shared_timed_mutex
#     error "__cpp_lib_shared_timed_mutex should be defined in c++14"
#   endif
#   if __cpp_lib_shared_timed_mutex != 201402L
#     error "__cpp_lib_shared_timed_mutex should have the value 201402L in c++14"
#   endif
# else
#   ifdef __cpp_lib_shared_timed_mutex
#     error "__cpp_lib_shared_timed_mutex should not be defined when !defined(_LIBCPP_HAS_NO_THREADS) is not defined!"
#   endif
# endif

# ifndef __cpp_lib_string_udls
#   error "__cpp_lib_string_udls should be defined in c++14"
# endif
# if __cpp_lib_string_udls != 201304L
#   error "__cpp_lib_string_udls should have the value 201304L in c++14"
# endif

# ifdef __cpp_lib_string_view
#   error "__cpp_lib_string_view should not be defined before c++17"
# endif

# ifdef __cpp_lib_three_way_comparison
#   error "__cpp_lib_three_way_comparison should not be defined before c++2a"
# endif

# ifdef __cpp_lib_to_chars
#   error "__cpp_lib_to_chars should not be defined before c++17"
# endif

# ifndef __cpp_lib_transformation_trait_aliases
#   error "__cpp_lib_transformation_trait_aliases should be defined in c++14"
# endif
# if __cpp_lib_transformation_trait_aliases != 201304L
#   error "__cpp_lib_transformation_trait_aliases should have the value 201304L in c++14"
# endif

# ifndef __cpp_lib_transparent_operators
#   error "__cpp_lib_transparent_operators should be defined in c++14"
# endif
# if __cpp_lib_transparent_operators != 201210L
#   error "__cpp_lib_transparent_operators should have the value 201210L in c++14"
# endif

# ifndef __cpp_lib_tuple_element_t
#   error "__cpp_lib_tuple_element_t should be defined in c++14"
# endif
# if __cpp_lib_tuple_element_t != 201402L
#   error "__cpp_lib_tuple_element_t should have the value 201402L in c++14"
# endif

# ifndef __cpp_lib_tuples_by_type
#   error "__cpp_lib_tuples_by_type should be defined in c++14"
# endif
# if __cpp_lib_tuples_by_type != 201304L
#   error "__cpp_lib_tuples_by_type should have the value 201304L in c++14"
# endif

# ifdef __cpp_lib_type_trait_variable_templates
#   error "__cpp_lib_type_trait_variable_templates should not be defined before c++17"
# endif

# ifdef __cpp_lib_uncaught_exceptions
#   error "__cpp_lib_uncaught_exceptions should not be defined before c++17"
# endif

# ifdef __cpp_lib_unordered_map_try_emplace
#   error "__cpp_lib_unordered_map_try_emplace should not be defined before c++17"
# endif

# ifdef __cpp_lib_variant
#   error "__cpp_lib_variant should not be defined before c++17"
# endif

# ifdef __cpp_lib_void_t
#   error "__cpp_lib_void_t should not be defined before c++17"
# endif

#elif TEST_STD_VER == 17

# if TEST_HAS_BUILTIN(__builtin_addressof) || TEST_GCC_VER >= 700
#   ifndef __cpp_lib_addressof_constexpr
#     error "__cpp_lib_addressof_constexpr should be defined in c++17"
#   endif
#   if __cpp_lib_addressof_constexpr != 201603L
#     error "__cpp_lib_addressof_constexpr should have the value 201603L in c++17"
#   endif
# else
#   ifdef __cpp_lib_addressof_constexpr
#     error "__cpp_lib_addressof_constexpr should not be defined when TEST_HAS_BUILTIN(__builtin_addressof) || TEST_GCC_VER >= 700 is not defined!"
#   endif
# endif

# ifndef __cpp_lib_allocator_traits_is_always_equal
#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++17"
# endif
# if __cpp_lib_allocator_traits_is_always_equal != 201411L
#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++17"
# endif

# ifndef __cpp_lib_any
#   error "__cpp_lib_any should be defined in c++17"
# endif
# if __cpp_lib_any != 201606L
#   error "__cpp_lib_any should have the value 201606L in c++17"
# endif

# ifndef __cpp_lib_apply
#   error "__cpp_lib_apply should be defined in c++17"
# endif
# if __cpp_lib_apply != 201603L
#   error "__cpp_lib_apply should have the value 201603L in c++17"
# endif

# ifndef __cpp_lib_array_constexpr
#   error "__cpp_lib_array_constexpr should be defined in c++17"
# endif
# if __cpp_lib_array_constexpr != 201603L
#   error "__cpp_lib_array_constexpr should have the value 201603L in c++17"
# endif

# ifndef __cpp_lib_as_const
#   error "__cpp_lib_as_const should be defined in c++17"
# endif
# if __cpp_lib_as_const != 201510L
#   error "__cpp_lib_as_const should have the value 201510L in c++17"
# endif

# if !defined(_LIBCPP_HAS_NO_THREADS)
#   ifndef __cpp_lib_atomic_is_always_lock_free
#     error "__cpp_lib_atomic_is_always_lock_free should be defined in c++17"
#   endif
#   if __cpp_lib_atomic_is_always_lock_free != 201603L
#     error "__cpp_lib_atomic_is_always_lock_free should have the value 201603L in c++17"
#   endif
# else
#   ifdef __cpp_lib_atomic_is_always_lock_free
#     error "__cpp_lib_atomic_is_always_lock_free should not be defined when !defined(_LIBCPP_HAS_NO_THREADS) is not defined!"
#   endif
# endif

# ifdef __cpp_lib_atomic_ref
#   error "__cpp_lib_atomic_ref should not be defined before c++2a"
# endif

# ifdef __cpp_lib_bind_front
#   error "__cpp_lib_bind_front should not be defined before c++2a"
# endif

# ifdef __cpp_lib_bit_cast
#   error "__cpp_lib_bit_cast should not be defined before c++2a"
# endif

# ifndef __cpp_lib_bool_constant
#   error "__cpp_lib_bool_constant should be defined in c++17"
# endif
# if __cpp_lib_bool_constant != 201505L
#   error "__cpp_lib_bool_constant should have the value 201505L in c++17"
# endif

# if !defined(_LIBCPP_VERSION)
#   ifndef __cpp_lib_boyer_moore_searcher
#     error "__cpp_lib_boyer_moore_searcher should be defined in c++17"
#   endif
#   if __cpp_lib_boyer_moore_searcher != 201603L
#     error "__cpp_lib_boyer_moore_searcher should have the value 201603L in c++17"
#   endif
# else // _LIBCPP_VERSION
#   ifdef __cpp_lib_boyer_moore_searcher
#     error "__cpp_lib_boyer_moore_searcher should not be defined because it is unimplemented in libc++!"
#   endif
# endif

# ifndef __cpp_lib_byte
#   error "__cpp_lib_byte should be defined in c++17"
# endif
# if __cpp_lib_byte != 201603L
#   error "__cpp_lib_byte should have the value 201603L in c++17"
# endif

# ifdef __cpp_lib_char8_t
#   error "__cpp_lib_char8_t should not be defined before c++2a"
# endif

# ifndef __cpp_lib_chrono
#   error "__cpp_lib_chrono should be defined in c++17"
# endif
# if __cpp_lib_chrono != 201611L
#   error "__cpp_lib_chrono should have the value 201611L in c++17"
# endif

# ifndef __cpp_lib_chrono_udls
#   error "__cpp_lib_chrono_udls should be defined in c++17"
# endif
# if __cpp_lib_chrono_udls != 201304L
#   error "__cpp_lib_chrono_udls should have the value 201304L in c++17"
# endif

# ifndef __cpp_lib_clamp
#   error "__cpp_lib_clamp should be defined in c++17"
# endif
# if __cpp_lib_clamp != 201603L
#   error "__cpp_lib_clamp should have the value 201603L in c++17"
# endif

# ifndef __cpp_lib_complex_udls
#   error "__cpp_lib_complex_udls should be defined in c++17"
# endif
# if __cpp_lib_complex_udls != 201309L
#   error "__cpp_lib_complex_udls should have the value 201309L in c++17"
# endif

# ifdef __cpp_lib_concepts
#   error "__cpp_lib_concepts should not be defined before c++2a"
# endif

# ifdef __cpp_lib_constexpr_misc
#   error "__cpp_lib_constexpr_misc should not be defined before c++2a"
# endif

# ifdef __cpp_lib_constexpr_swap_algorithms
#   error "__cpp_lib_constexpr_swap_algorithms should not be defined before c++2a"
# endif

# ifdef __cpp_lib_destroying_delete
#   error "__cpp_lib_destroying_delete should not be defined before c++2a"
# endif

# ifndef __cpp_lib_enable_shared_from_this
#   error "__cpp_lib_enable_shared_from_this should be defined in c++17"
# endif
# if __cpp_lib_enable_shared_from_this != 201603L
#   error "__cpp_lib_enable_shared_from_this should have the value 201603L in c++17"
# endif

# ifdef __cpp_lib_erase_if
#   error "__cpp_lib_erase_if should not be defined before c++2a"
# endif

# ifndef __cpp_lib_exchange_function
#   error "__cpp_lib_exchange_function should be defined in c++17"
# endif
# if __cpp_lib_exchange_function != 201304L
#   error "__cpp_lib_exchange_function should have the value 201304L in c++17"
# endif

# if !defined(_LIBCPP_VERSION)
#   ifndef __cpp_lib_execution
#     error "__cpp_lib_execution should be defined in c++17"
#   endif
#   if __cpp_lib_execution != 201603L
#     error "__cpp_lib_execution should have the value 201603L in c++17"
#   endif
# else // _LIBCPP_VERSION
#   ifdef __cpp_lib_execution
#     error "__cpp_lib_execution should not be defined because it is unimplemented in libc++!"
#   endif
# endif

# ifndef __cpp_lib_filesystem
#   error "__cpp_lib_filesystem should be defined in c++17"
# endif
# if __cpp_lib_filesystem != 201703L
#   error "__cpp_lib_filesystem should have the value 201703L in c++17"
# endif

# ifndef __cpp_lib_gcd_lcm
#   error "__cpp_lib_gcd_lcm should be defined in c++17"
# endif
# if __cpp_lib_gcd_lcm != 201606L
#   error "__cpp_lib_gcd_lcm should have the value 201606L in c++17"
# endif

# ifndef __cpp_lib_generic_associative_lookup
#   error "__cpp_lib_generic_associative_lookup should be defined in c++17"
# endif
# if __cpp_lib_generic_associative_lookup != 201304L
#   error "__cpp_lib_generic_associative_lookup should have the value 201304L in c++17"
# endif

# ifdef __cpp_lib_generic_unordered_lookup
#   error "__cpp_lib_generic_unordered_lookup should not be defined before c++2a"
# endif

# ifndef __cpp_lib_hardware_interference_size
#   error "__cpp_lib_hardware_interference_size should be defined in c++17"
# endif
# if __cpp_lib_hardware_interference_size != 201703L
#   error "__cpp_lib_hardware_interference_size should have the value 201703L in c++17"
# endif

# if TEST_HAS_BUILTIN_IDENTIFIER(__has_unique_object_representations) || TEST_GCC_VER >= 700
#   ifndef __cpp_lib_has_unique_object_representations
#     error "__cpp_lib_has_unique_object_representations should be defined in c++17"
#   endif
#   if __cpp_lib_has_unique_object_representations != 201606L
#     error "__cpp_lib_has_unique_object_representations should have the value 201606L in c++17"
#   endif
# else
#   ifdef __cpp_lib_has_unique_object_representations
#     error "__cpp_lib_has_unique_object_representations should not be defined when TEST_HAS_BUILTIN_IDENTIFIER(__has_unique_object_representations) || TEST_GCC_VER >= 700 is not defined!"
#   endif
# endif

# ifndef __cpp_lib_hypot
#   error "__cpp_lib_hypot should be defined in c++17"
# endif
# if __cpp_lib_hypot != 201603L
#   error "__cpp_lib_hypot should have the value 201603L in c++17"
# endif

# ifndef __cpp_lib_incomplete_container_elements
#   error "__cpp_lib_incomplete_container_elements should be defined in c++17"
# endif
# if __cpp_lib_incomplete_container_elements != 201505L
#   error "__cpp_lib_incomplete_container_elements should have the value 201505L in c++17"
# endif

# ifndef __cpp_lib_integer_sequence
#   error "__cpp_lib_integer_sequence should be defined in c++17"
# endif
# if __cpp_lib_integer_sequence != 201304L
#   error "__cpp_lib_integer_sequence should have the value 201304L in c++17"
# endif

# ifndef __cpp_lib_integral_constant_callable
#   error "__cpp_lib_integral_constant_callable should be defined in c++17"
# endif
# if __cpp_lib_integral_constant_callable != 201304L
#   error "__cpp_lib_integral_constant_callable should have the value 201304L in c++17"
# endif

# ifdef __cpp_lib_interpolate
#   error "__cpp_lib_interpolate should not be defined before c++2a"
# endif

# ifndef __cpp_lib_invoke
#   error "__cpp_lib_invoke should be defined in c++17"
# endif
# if __cpp_lib_invoke != 201411L
#   error "__cpp_lib_invoke should have the value 201411L in c++17"
# endif

# if TEST_HAS_BUILTIN_IDENTIFIER(__is_aggregate) || TEST_GCC_VER_NEW >= 7001
#   ifndef __cpp_lib_is_aggregate
#     error "__cpp_lib_is_aggregate should be defined in c++17"
#   endif
#   if __cpp_lib_is_aggregate != 201703L
#     error "__cpp_lib_is_aggregate should have the value 201703L in c++17"
#   endif
# else
#   ifdef __cpp_lib_is_aggregate
#     error "__cpp_lib_is_aggregate should not be defined when TEST_HAS_BUILTIN_IDENTIFIER(__is_aggregate) || TEST_GCC_VER_NEW >= 7001 is not defined!"
#   endif
# endif

# ifdef __cpp_lib_is_constant_evaluated
#   error "__cpp_lib_is_constant_evaluated should not be defined before c++2a"
# endif

# ifndef __cpp_lib_is_final
#   error "__cpp_lib_is_final should be defined in c++17"
# endif
# if __cpp_lib_is_final != 201402L
#   error "__cpp_lib_is_final should have the value 201402L in c++17"
# endif

# ifndef __cpp_lib_is_invocable
#   error "__cpp_lib_is_invocable should be defined in c++17"
# endif
# if __cpp_lib_is_invocable != 201703L
#   error "__cpp_lib_is_invocable should have the value 201703L in c++17"
# endif

# ifndef __cpp_lib_is_null_pointer
#   error "__cpp_lib_is_null_pointer should be defined in c++17"
# endif
# if __cpp_lib_is_null_pointer != 201309L
#   error "__cpp_lib_is_null_pointer should have the value 201309L in c++17"
# endif

# ifndef __cpp_lib_is_swappable
#   error "__cpp_lib_is_swappable should be defined in c++17"
# endif
# if __cpp_lib_is_swappable != 201603L
#   error "__cpp_lib_is_swappable should have the value 201603L in c++17"
# endif

# ifndef __cpp_lib_launder
#   error "__cpp_lib_launder should be defined in c++17"
# endif
# if __cpp_lib_launder != 201606L
#   error "__cpp_lib_launder should have the value 201606L in c++17"
# endif

# ifdef __cpp_lib_list_remove_return_type
#   error "__cpp_lib_list_remove_return_type should not be defined before c++2a"
# endif

# ifndef __cpp_lib_logical_traits
#   error "__cpp_lib_logical_traits should be defined in c++17"
# endif
# if __cpp_lib_logical_traits != 201510L
#   error "__cpp_lib_logical_traits should have the value 201510L in c++17"
# endif

# ifndef __cpp_lib_make_from_tuple
#   error "__cpp_lib_make_from_tuple should be defined in c++17"
# endif
# if __cpp_lib_make_from_tuple != 201606L
#   error "__cpp_lib_make_from_tuple should have the value 201606L in c++17"
# endif

# ifndef __cpp_lib_make_reverse_iterator
#   error "__cpp_lib_make_reverse_iterator should be defined in c++17"
# endif
# if __cpp_lib_make_reverse_iterator != 201402L
#   error "__cpp_lib_make_reverse_iterator should have the value 201402L in c++17"
# endif

# ifndef __cpp_lib_make_unique
#   error "__cpp_lib_make_unique should be defined in c++17"
# endif
# if __cpp_lib_make_unique != 201304L
#   error "__cpp_lib_make_unique should have the value 201304L in c++17"
# endif

# ifndef __cpp_lib_map_try_emplace
#   error "__cpp_lib_map_try_emplace should be defined in c++17"
# endif
# if __cpp_lib_map_try_emplace != 201411L
#   error "__cpp_lib_map_try_emplace should have the value 201411L in c++17"
# endif

# if !defined(_LIBCPP_VERSION)
#   ifndef __cpp_lib_math_special_functions
#     error "__cpp_lib_math_special_functions should be defined in c++17"
#   endif
#   if __cpp_lib_math_special_functions != 201603L
#     error "__cpp_lib_math_special_functions should have the value 201603L in c++17"
#   endif
# else // _LIBCPP_VERSION
#   ifdef __cpp_lib_math_special_functions
#     error "__cpp_lib_math_special_functions should not be defined because it is unimplemented in libc++!"
#   endif
# endif

# if !defined(_LIBCPP_VERSION)
#   ifndef __cpp_lib_memory_resource
#     error "__cpp_lib_memory_resource should be defined in c++17"
#   endif
#   if __cpp_lib_memory_resource != 201603L
#     error "__cpp_lib_memory_resource should have the value 201603L in c++17"
#   endif
# else // _LIBCPP_VERSION
#   ifdef __cpp_lib_memory_resource
#     error "__cpp_lib_memory_resource should not be defined because it is unimplemented in libc++!"
#   endif
# endif

# ifndef __cpp_lib_node_extract
#   error "__cpp_lib_node_extract should be defined in c++17"
# endif
# if __cpp_lib_node_extract != 201606L
#   error "__cpp_lib_node_extract should have the value 201606L in c++17"
# endif

# ifndef __cpp_lib_nonmember_container_access
#   error "__cpp_lib_nonmember_container_access should be defined in c++17"
# endif
# if __cpp_lib_nonmember_container_access != 201411L
#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++17"
# endif

# ifndef __cpp_lib_not_fn
#   error "__cpp_lib_not_fn should be defined in c++17"
# endif
# if __cpp_lib_not_fn != 201603L
#   error "__cpp_lib_not_fn should have the value 201603L in c++17"
# endif

# ifndef __cpp_lib_null_iterators
#   error "__cpp_lib_null_iterators should be defined in c++17"
# endif
# if __cpp_lib_null_iterators != 201304L
#   error "__cpp_lib_null_iterators should have the value 201304L in c++17"
# endif

# ifndef __cpp_lib_optional
#   error "__cpp_lib_optional should be defined in c++17"
# endif
# if __cpp_lib_optional != 201606L
#   error "__cpp_lib_optional should have the value 201606L in c++17"
# endif

# if !defined(_LIBCPP_VERSION)
#   ifndef __cpp_lib_parallel_algorithm
#     error "__cpp_lib_parallel_algorithm should be defined in c++17"
#   endif
#   if __cpp_lib_parallel_algorithm != 201603L
#     error "__cpp_lib_parallel_algorithm should have the value 201603L in c++17"
#   endif
# else // _LIBCPP_VERSION
#   ifdef __cpp_lib_parallel_algorithm
#     error "__cpp_lib_parallel_algorithm should not be defined because it is unimplemented in libc++!"
#   endif
# endif

# ifndef __cpp_lib_quoted_string_io
#   error "__cpp_lib_quoted_string_io should be defined in c++17"
# endif
# if __cpp_lib_quoted_string_io != 201304L
#   error "__cpp_lib_quoted_string_io should have the value 201304L in c++17"
# endif

# ifdef __cpp_lib_ranges
#   error "__cpp_lib_ranges should not be defined before c++2a"
# endif

# ifndef __cpp_lib_raw_memory_algorithms
#   error "__cpp_lib_raw_memory_algorithms should be defined in c++17"
# endif
# if __cpp_lib_raw_memory_algorithms != 201606L
#   error "__cpp_lib_raw_memory_algorithms should have the value 201606L in c++17"
# endif

# ifndef __cpp_lib_result_of_sfinae
#   error "__cpp_lib_result_of_sfinae should be defined in c++17"
# endif
# if __cpp_lib_result_of_sfinae != 201210L
#   error "__cpp_lib_result_of_sfinae should have the value 201210L in c++17"
# endif

# ifndef __cpp_lib_robust_nonmodifying_seq_ops
#   error "__cpp_lib_robust_nonmodifying_seq_ops should be defined in c++17"
# endif
# if __cpp_lib_robust_nonmodifying_seq_ops != 201304L
#   error "__cpp_lib_robust_nonmodifying_seq_ops should have the value 201304L in c++17"
# endif

# ifndef __cpp_lib_sample
#   error "__cpp_lib_sample should be defined in c++17"
# endif
# if __cpp_lib_sample != 201603L
#   error "__cpp_lib_sample should have the value 201603L in c++17"
# endif

# ifndef __cpp_lib_scoped_lock
#   error "__cpp_lib_scoped_lock should be defined in c++17"
# endif
# if __cpp_lib_scoped_lock != 201703L
#   error "__cpp_lib_scoped_lock should have the value 201703L in c++17"
# endif

# if !defined(_LIBCPP_HAS_NO_THREADS)
#   ifndef __cpp_lib_shared_mutex
#     error "__cpp_lib_shared_mutex should be defined in c++17"
#   endif
#   if __cpp_lib_shared_mutex != 201505L
#     error "__cpp_lib_shared_mutex should have the value 201505L in c++17"
#   endif
# else
#   ifdef __cpp_lib_shared_mutex
#     error "__cpp_lib_shared_mutex should not be defined when !defined(_LIBCPP_HAS_NO_THREADS) is not defined!"
#   endif
# endif

# if !defined(_LIBCPP_VERSION)
#   ifndef __cpp_lib_shared_ptr_arrays
#     error "__cpp_lib_shared_ptr_arrays should be defined in c++17"
#   endif
#   if __cpp_lib_shared_ptr_arrays != 201611L
#     error "__cpp_lib_shared_ptr_arrays should have the value 201611L in c++17"
#   endif
# else // _LIBCPP_VERSION
#   ifdef __cpp_lib_shared_ptr_arrays
#     error "__cpp_lib_shared_ptr_arrays should not be defined because it is unimplemented in libc++!"
#   endif
# endif

# ifndef __cpp_lib_shared_ptr_weak_type
#   error "__cpp_lib_shared_ptr_weak_type should be defined in c++17"
# endif
# if __cpp_lib_shared_ptr_weak_type != 201606L
#   error "__cpp_lib_shared_ptr_weak_type should have the value 201606L in c++17"
# endif

# if !defined(_LIBCPP_HAS_NO_THREADS)
#   ifndef __cpp_lib_shared_timed_mutex
#     error "__cpp_lib_shared_timed_mutex should be defined in c++17"
#   endif
#   if __cpp_lib_shared_timed_mutex != 201402L
#     error "__cpp_lib_shared_timed_mutex should have the value 201402L in c++17"
#   endif
# else
#   ifdef __cpp_lib_shared_timed_mutex
#     error "__cpp_lib_shared_timed_mutex should not be defined when !defined(_LIBCPP_HAS_NO_THREADS) is not defined!"
#   endif
# endif

# ifndef __cpp_lib_string_udls
#   error "__cpp_lib_string_udls should be defined in c++17"
# endif
# if __cpp_lib_string_udls != 201304L
#   error "__cpp_lib_string_udls should have the value 201304L in c++17"
# endif

# ifndef __cpp_lib_string_view
#   error "__cpp_lib_string_view should be defined in c++17"
# endif
# if __cpp_lib_string_view != 201606L
#   error "__cpp_lib_string_view should have the value 201606L in c++17"
# endif

# ifdef __cpp_lib_three_way_comparison
#   error "__cpp_lib_three_way_comparison should not be defined before c++2a"
# endif

# if !defined(_LIBCPP_VERSION)
#   ifndef __cpp_lib_to_chars
#     error "__cpp_lib_to_chars should be defined in c++17"
#   endif
#   if __cpp_lib_to_chars != 201611L
#     error "__cpp_lib_to_chars should have the value 201611L in c++17"
#   endif
# else // _LIBCPP_VERSION
#   ifdef __cpp_lib_to_chars
#     error "__cpp_lib_to_chars should not be defined because it is unimplemented in libc++!"
#   endif
# endif

# ifndef __cpp_lib_transformation_trait_aliases
#   error "__cpp_lib_transformation_trait_aliases should be defined in c++17"
# endif
# if __cpp_lib_transformation_trait_aliases != 201304L
#   error "__cpp_lib_transformation_trait_aliases should have the value 201304L in c++17"
# endif

# ifndef __cpp_lib_transparent_operators
#   error "__cpp_lib_transparent_operators should be defined in c++17"
# endif
# if __cpp_lib_transparent_operators != 201510L
#   error "__cpp_lib_transparent_operators should have the value 201510L in c++17"
# endif

# ifndef __cpp_lib_tuple_element_t
#   error "__cpp_lib_tuple_element_t should be defined in c++17"
# endif
# if __cpp_lib_tuple_element_t != 201402L
#   error "__cpp_lib_tuple_element_t should have the value 201402L in c++17"
# endif

# ifndef __cpp_lib_tuples_by_type
#   error "__cpp_lib_tuples_by_type should be defined in c++17"
# endif
# if __cpp_lib_tuples_by_type != 201304L
#   error "__cpp_lib_tuples_by_type should have the value 201304L in c++17"
# endif

# ifndef __cpp_lib_type_trait_variable_templates
#   error "__cpp_lib_type_trait_variable_templates should be defined in c++17"
# endif
# if __cpp_lib_type_trait_variable_templates != 201510L
#   error "__cpp_lib_type_trait_variable_templates should have the value 201510L in c++17"
# endif

# ifndef __cpp_lib_uncaught_exceptions
#   error "__cpp_lib_uncaught_exceptions should be defined in c++17"
# endif
# if __cpp_lib_uncaught_exceptions != 201411L
#   error "__cpp_lib_uncaught_exceptions should have the value 201411L in c++17"
# endif

# ifndef __cpp_lib_unordered_map_try_emplace
#   error "__cpp_lib_unordered_map_try_emplace should be defined in c++17"
# endif
# if __cpp_lib_unordered_map_try_emplace != 201411L
#   error "__cpp_lib_unordered_map_try_emplace should have the value 201411L in c++17"
# endif

# ifndef __cpp_lib_variant
#   error "__cpp_lib_variant should be defined in c++17"
# endif
# if __cpp_lib_variant != 201606L
#   error "__cpp_lib_variant should have the value 201606L in c++17"
# endif

# ifndef __cpp_lib_void_t
#   error "__cpp_lib_void_t should be defined in c++17"
# endif
# if __cpp_lib_void_t != 201411L
#   error "__cpp_lib_void_t should have the value 201411L in c++17"
# endif

#elif TEST_STD_VER > 17

# if TEST_HAS_BUILTIN(__builtin_addressof) || TEST_GCC_VER >= 700
#   ifndef __cpp_lib_addressof_constexpr
#     error "__cpp_lib_addressof_constexpr should be defined in c++2a"
#   endif
#   if __cpp_lib_addressof_constexpr != 201603L
#     error "__cpp_lib_addressof_constexpr should have the value 201603L in c++2a"
#   endif
# else
#   ifdef __cpp_lib_addressof_constexpr
#     error "__cpp_lib_addressof_constexpr should not be defined when TEST_HAS_BUILTIN(__builtin_addressof) || TEST_GCC_VER >= 700 is not defined!"
#   endif
# endif

# ifndef __cpp_lib_allocator_traits_is_always_equal
#   error "__cpp_lib_allocator_traits_is_always_equal should be defined in c++2a"
# endif
# if __cpp_lib_allocator_traits_is_always_equal != 201411L
#   error "__cpp_lib_allocator_traits_is_always_equal should have the value 201411L in c++2a"
# endif

# ifndef __cpp_lib_any
#   error "__cpp_lib_any should be defined in c++2a"
# endif
# if __cpp_lib_any != 201606L
#   error "__cpp_lib_any should have the value 201606L in c++2a"
# endif

# ifndef __cpp_lib_apply
#   error "__cpp_lib_apply should be defined in c++2a"
# endif
# if __cpp_lib_apply != 201603L
#   error "__cpp_lib_apply should have the value 201603L in c++2a"
# endif

# ifndef __cpp_lib_array_constexpr
#   error "__cpp_lib_array_constexpr should be defined in c++2a"
# endif
# if __cpp_lib_array_constexpr != 201603L
#   error "__cpp_lib_array_constexpr should have the value 201603L in c++2a"
# endif

# ifndef __cpp_lib_as_const
#   error "__cpp_lib_as_const should be defined in c++2a"
# endif
# if __cpp_lib_as_const != 201510L
#   error "__cpp_lib_as_const should have the value 201510L in c++2a"
# endif

# if !defined(_LIBCPP_HAS_NO_THREADS)
#   ifndef __cpp_lib_atomic_is_always_lock_free
#     error "__cpp_lib_atomic_is_always_lock_free should be defined in c++2a"
#   endif
#   if __cpp_lib_atomic_is_always_lock_free != 201603L
#     error "__cpp_lib_atomic_is_always_lock_free should have the value 201603L in c++2a"
#   endif
# else
#   ifdef __cpp_lib_atomic_is_always_lock_free
#     error "__cpp_lib_atomic_is_always_lock_free should not be defined when !defined(_LIBCPP_HAS_NO_THREADS) is not defined!"
#   endif
# endif

# if !defined(_LIBCPP_VERSION)
#   ifndef __cpp_lib_atomic_ref
#     error "__cpp_lib_atomic_ref should be defined in c++2a"
#   endif
#   if __cpp_lib_atomic_ref != 201806L
#     error "__cpp_lib_atomic_ref should have the value 201806L in c++2a"
#   endif
# else // _LIBCPP_VERSION
#   ifdef __cpp_lib_atomic_ref
#     error "__cpp_lib_atomic_ref should not be defined because it is unimplemented in libc++!"
#   endif
# endif

# if !defined(_LIBCPP_VERSION)
#   ifndef __cpp_lib_bind_front
#     error "__cpp_lib_bind_front should be defined in c++2a"
#   endif
#   if __cpp_lib_bind_front != 201811L
#     error "__cpp_lib_bind_front should have the value 201811L in c++2a"
#   endif
# else // _LIBCPP_VERSION
#   ifdef __cpp_lib_bind_front
#     error "__cpp_lib_bind_front should not be defined because it is unimplemented in libc++!"
#   endif
# endif

# if !defined(_LIBCPP_VERSION)
#   ifndef __cpp_lib_bit_cast
#     error "__cpp_lib_bit_cast should be defined in c++2a"
#   endif
#   if __cpp_lib_bit_cast != 201806L
#     error "__cpp_lib_bit_cast should have the value 201806L in c++2a"
#   endif
# else // _LIBCPP_VERSION
#   ifdef __cpp_lib_bit_cast
#     error "__cpp_lib_bit_cast should not be defined because it is unimplemented in libc++!"
#   endif
# endif

# ifndef __cpp_lib_bool_constant
#   error "__cpp_lib_bool_constant should be defined in c++2a"
# endif
# if __cpp_lib_bool_constant != 201505L
#   error "__cpp_lib_bool_constant should have the value 201505L in c++2a"
# endif

# if !defined(_LIBCPP_VERSION)
#   ifndef __cpp_lib_boyer_moore_searcher
#     error "__cpp_lib_boyer_moore_searcher should be defined in c++2a"
#   endif
#   if __cpp_lib_boyer_moore_searcher != 201603L
#     error "__cpp_lib_boyer_moore_searcher should have the value 201603L in c++2a"
#   endif
# else // _LIBCPP_VERSION
#   ifdef __cpp_lib_boyer_moore_searcher
#     error "__cpp_lib_boyer_moore_searcher should not be defined because it is unimplemented in libc++!"
#   endif
# endif

# ifndef __cpp_lib_byte
#   error "__cpp_lib_byte should be defined in c++2a"
# endif
# if __cpp_lib_byte != 201603L
#   error "__cpp_lib_byte should have the value 201603L in c++2a"
# endif

# if defined(__cpp_char8_t)
#   ifndef __cpp_lib_char8_t
#     error "__cpp_lib_char8_t should be defined in c++2a"
#   endif
#   if __cpp_lib_char8_t != 201811L
#     error "__cpp_lib_char8_t should have the value 201811L in c++2a"
#   endif
# else
#   ifdef __cpp_lib_char8_t
#     error "__cpp_lib_char8_t should not be defined when defined(__cpp_char8_t) is not defined!"
#   endif
# endif

# ifndef __cpp_lib_chrono
#   error "__cpp_lib_chrono should be defined in c++2a"
# endif
# if __cpp_lib_chrono != 201611L
#   error "__cpp_lib_chrono should have the value 201611L in c++2a"
# endif

# ifndef __cpp_lib_chrono_udls
#   error "__cpp_lib_chrono_udls should be defined in c++2a"
# endif
# if __cpp_lib_chrono_udls != 201304L
#   error "__cpp_lib_chrono_udls should have the value 201304L in c++2a"
# endif

# ifndef __cpp_lib_clamp
#   error "__cpp_lib_clamp should be defined in c++2a"
# endif
# if __cpp_lib_clamp != 201603L
#   error "__cpp_lib_clamp should have the value 201603L in c++2a"
# endif

# ifndef __cpp_lib_complex_udls
#   error "__cpp_lib_complex_udls should be defined in c++2a"
# endif
# if __cpp_lib_complex_udls != 201309L
#   error "__cpp_lib_complex_udls should have the value 201309L in c++2a"
# endif

# if !defined(_LIBCPP_VERSION)
#   ifndef __cpp_lib_concepts
#     error "__cpp_lib_concepts should be defined in c++2a"
#   endif
#   if __cpp_lib_concepts != 201806L
#     error "__cpp_lib_concepts should have the value 201806L in c++2a"
#   endif
# else // _LIBCPP_VERSION
#   ifdef __cpp_lib_concepts
#     error "__cpp_lib_concepts should not be defined because it is unimplemented in libc++!"
#   endif
# endif

# if !defined(_LIBCPP_VERSION)
#   ifndef __cpp_lib_constexpr_misc
#     error "__cpp_lib_constexpr_misc should be defined in c++2a"
#   endif
#   if __cpp_lib_constexpr_misc != 201811L
#     error "__cpp_lib_constexpr_misc should have the value 201811L in c++2a"
#   endif
# else // _LIBCPP_VERSION
#   ifdef __cpp_lib_constexpr_misc
#     error "__cpp_lib_constexpr_misc should not be defined because it is unimplemented in libc++!"
#   endif
# endif

# if !defined(_LIBCPP_VERSION)
#   ifndef __cpp_lib_constexpr_swap_algorithms
#     error "__cpp_lib_constexpr_swap_algorithms should be defined in c++2a"
#   endif
#   if __cpp_lib_constexpr_swap_algorithms != 201806L
#     error "__cpp_lib_constexpr_swap_algorithms should have the value 201806L in c++2a"
#   endif
# else // _LIBCPP_VERSION
#   ifdef __cpp_lib_constexpr_swap_algorithms
#     error "__cpp_lib_constexpr_swap_algorithms should not be defined because it is unimplemented in libc++!"
#   endif
# endif

# if TEST_STD_VER > 17 && defined(__cpp_impl_destroying_delete) && __cpp_impl_destroying_delete >= 201806L
#   ifndef __cpp_lib_destroying_delete
#     error "__cpp_lib_destroying_delete should be defined in c++2a"
#   endif
#   if __cpp_lib_destroying_delete != 201806L
#     error "__cpp_lib_destroying_delete should have the value 201806L in c++2a"
#   endif
# else
#   ifdef __cpp_lib_destroying_delete
#     error "__cpp_lib_destroying_delete should not be defined when TEST_STD_VER > 17 && defined(__cpp_impl_destroying_delete) && __cpp_impl_destroying_delete >= 201806L is not defined!"
#   endif
# endif

# ifndef __cpp_lib_enable_shared_from_this
#   error "__cpp_lib_enable_shared_from_this should be defined in c++2a"
# endif
# if __cpp_lib_enable_shared_from_this != 201603L
#   error "__cpp_lib_enable_shared_from_this should have the value 201603L in c++2a"
# endif

# ifndef __cpp_lib_erase_if
#   error "__cpp_lib_erase_if should be defined in c++2a"
# endif
# if __cpp_lib_erase_if != 201811L
#   error "__cpp_lib_erase_if should have the value 201811L in c++2a"
# endif

# ifndef __cpp_lib_exchange_function
#   error "__cpp_lib_exchange_function should be defined in c++2a"
# endif
# if __cpp_lib_exchange_function != 201304L
#   error "__cpp_lib_exchange_function should have the value 201304L in c++2a"
# endif

# if !defined(_LIBCPP_VERSION)
#   ifndef __cpp_lib_execution
#     error "__cpp_lib_execution should be defined in c++2a"
#   endif
#   if __cpp_lib_execution != 201603L
#     error "__cpp_lib_execution should have the value 201603L in c++2a"
#   endif
# else // _LIBCPP_VERSION
#   ifdef __cpp_lib_execution
#     error "__cpp_lib_execution should not be defined because it is unimplemented in libc++!"
#   endif
# endif

# ifndef __cpp_lib_filesystem
#   error "__cpp_lib_filesystem should be defined in c++2a"
# endif
# if __cpp_lib_filesystem != 201703L
#   error "__cpp_lib_filesystem should have the value 201703L in c++2a"
# endif

# ifndef __cpp_lib_gcd_lcm
#   error "__cpp_lib_gcd_lcm should be defined in c++2a"
# endif
# if __cpp_lib_gcd_lcm != 201606L
#   error "__cpp_lib_gcd_lcm should have the value 201606L in c++2a"
# endif

# ifndef __cpp_lib_generic_associative_lookup
#   error "__cpp_lib_generic_associative_lookup should be defined in c++2a"
# endif
# if __cpp_lib_generic_associative_lookup != 201304L
#   error "__cpp_lib_generic_associative_lookup should have the value 201304L in c++2a"
# endif

# if !defined(_LIBCPP_VERSION)
#   ifndef __cpp_lib_generic_unordered_lookup
#     error "__cpp_lib_generic_unordered_lookup should be defined in c++2a"
#   endif
#   if __cpp_lib_generic_unordered_lookup != 201811L
#     error "__cpp_lib_generic_unordered_lookup should have the value 201811L in c++2a"
#   endif
# else // _LIBCPP_VERSION
#   ifdef __cpp_lib_generic_unordered_lookup
#     error "__cpp_lib_generic_unordered_lookup should not be defined because it is unimplemented in libc++!"
#   endif
# endif

# ifndef __cpp_lib_hardware_interference_size
#   error "__cpp_lib_hardware_interference_size should be defined in c++2a"
# endif
# if __cpp_lib_hardware_interference_size != 201703L
#   error "__cpp_lib_hardware_interference_size should have the value 201703L in c++2a"
# endif

# if TEST_HAS_BUILTIN_IDENTIFIER(__has_unique_object_representations) || TEST_GCC_VER >= 700
#   ifndef __cpp_lib_has_unique_object_representations
#     error "__cpp_lib_has_unique_object_representations should be defined in c++2a"
#   endif
#   if __cpp_lib_has_unique_object_representations != 201606L
#     error "__cpp_lib_has_unique_object_representations should have the value 201606L in c++2a"
#   endif
# else
#   ifdef __cpp_lib_has_unique_object_representations
#     error "__cpp_lib_has_unique_object_representations should not be defined when TEST_HAS_BUILTIN_IDENTIFIER(__has_unique_object_representations) || TEST_GCC_VER >= 700 is not defined!"
#   endif
# endif

# ifndef __cpp_lib_hypot
#   error "__cpp_lib_hypot should be defined in c++2a"
# endif
# if __cpp_lib_hypot != 201603L
#   error "__cpp_lib_hypot should have the value 201603L in c++2a"
# endif

# ifndef __cpp_lib_incomplete_container_elements
#   error "__cpp_lib_incomplete_container_elements should be defined in c++2a"
# endif
# if __cpp_lib_incomplete_container_elements != 201505L
#   error "__cpp_lib_incomplete_container_elements should have the value 201505L in c++2a"
# endif

# ifndef __cpp_lib_integer_sequence
#   error "__cpp_lib_integer_sequence should be defined in c++2a"
# endif
# if __cpp_lib_integer_sequence != 201304L
#   error "__cpp_lib_integer_sequence should have the value 201304L in c++2a"
# endif

# ifndef __cpp_lib_integral_constant_callable
#   error "__cpp_lib_integral_constant_callable should be defined in c++2a"
# endif
# if __cpp_lib_integral_constant_callable != 201304L
#   error "__cpp_lib_integral_constant_callable should have the value 201304L in c++2a"
# endif

# ifndef __cpp_lib_interpolate
#   error "__cpp_lib_interpolate should be defined in c++2a"
# endif
# if __cpp_lib_interpolate != 201902L
#   error "__cpp_lib_interpolate should have the value 201902L in c++2a"
# endif

# ifndef __cpp_lib_invoke
#   error "__cpp_lib_invoke should be defined in c++2a"
# endif
# if __cpp_lib_invoke != 201411L
#   error "__cpp_lib_invoke should have the value 201411L in c++2a"
# endif

# if TEST_HAS_BUILTIN_IDENTIFIER(__is_aggregate) || TEST_GCC_VER_NEW >= 7001
#   ifndef __cpp_lib_is_aggregate
#     error "__cpp_lib_is_aggregate should be defined in c++2a"
#   endif
#   if __cpp_lib_is_aggregate != 201703L
#     error "__cpp_lib_is_aggregate should have the value 201703L in c++2a"
#   endif
# else
#   ifdef __cpp_lib_is_aggregate
#     error "__cpp_lib_is_aggregate should not be defined when TEST_HAS_BUILTIN_IDENTIFIER(__is_aggregate) || TEST_GCC_VER_NEW >= 7001 is not defined!"
#   endif
# endif

# if TEST_HAS_BUILTIN(__builtin_is_constant_evaluated) || TEST_GCC_VER >= 900
#   ifndef __cpp_lib_is_constant_evaluated
#     error "__cpp_lib_is_constant_evaluated should be defined in c++2a"
#   endif
#   if __cpp_lib_is_constant_evaluated != 201811L
#     error "__cpp_lib_is_constant_evaluated should have the value 201811L in c++2a"
#   endif
# else
#   ifdef __cpp_lib_is_constant_evaluated
#     error "__cpp_lib_is_constant_evaluated should not be defined when TEST_HAS_BUILTIN(__builtin_is_constant_evaluated) || TEST_GCC_VER >= 900 is not defined!"
#   endif
# endif

# ifndef __cpp_lib_is_final
#   error "__cpp_lib_is_final should be defined in c++2a"
# endif
# if __cpp_lib_is_final != 201402L
#   error "__cpp_lib_is_final should have the value 201402L in c++2a"
# endif

# ifndef __cpp_lib_is_invocable
#   error "__cpp_lib_is_invocable should be defined in c++2a"
# endif
# if __cpp_lib_is_invocable != 201703L
#   error "__cpp_lib_is_invocable should have the value 201703L in c++2a"
# endif

# ifndef __cpp_lib_is_null_pointer
#   error "__cpp_lib_is_null_pointer should be defined in c++2a"
# endif
# if __cpp_lib_is_null_pointer != 201309L
#   error "__cpp_lib_is_null_pointer should have the value 201309L in c++2a"
# endif

# ifndef __cpp_lib_is_swappable
#   error "__cpp_lib_is_swappable should be defined in c++2a"
# endif
# if __cpp_lib_is_swappable != 201603L
#   error "__cpp_lib_is_swappable should have the value 201603L in c++2a"
# endif

# ifndef __cpp_lib_launder
#   error "__cpp_lib_launder should be defined in c++2a"
# endif
# if __cpp_lib_launder != 201606L
#   error "__cpp_lib_launder should have the value 201606L in c++2a"
# endif

# if !defined(_LIBCPP_VERSION)
#   ifndef __cpp_lib_list_remove_return_type
#     error "__cpp_lib_list_remove_return_type should be defined in c++2a"
#   endif
#   if __cpp_lib_list_remove_return_type != 201806L
#     error "__cpp_lib_list_remove_return_type should have the value 201806L in c++2a"
#   endif
# else // _LIBCPP_VERSION
#   ifdef __cpp_lib_list_remove_return_type
#     error "__cpp_lib_list_remove_return_type should not be defined because it is unimplemented in libc++!"
#   endif
# endif

# ifndef __cpp_lib_logical_traits
#   error "__cpp_lib_logical_traits should be defined in c++2a"
# endif
# if __cpp_lib_logical_traits != 201510L
#   error "__cpp_lib_logical_traits should have the value 201510L in c++2a"
# endif

# ifndef __cpp_lib_make_from_tuple
#   error "__cpp_lib_make_from_tuple should be defined in c++2a"
# endif
# if __cpp_lib_make_from_tuple != 201606L
#   error "__cpp_lib_make_from_tuple should have the value 201606L in c++2a"
# endif

# ifndef __cpp_lib_make_reverse_iterator
#   error "__cpp_lib_make_reverse_iterator should be defined in c++2a"
# endif
# if __cpp_lib_make_reverse_iterator != 201402L
#   error "__cpp_lib_make_reverse_iterator should have the value 201402L in c++2a"
# endif

# ifndef __cpp_lib_make_unique
#   error "__cpp_lib_make_unique should be defined in c++2a"
# endif
# if __cpp_lib_make_unique != 201304L
#   error "__cpp_lib_make_unique should have the value 201304L in c++2a"
# endif

# ifndef __cpp_lib_map_try_emplace
#   error "__cpp_lib_map_try_emplace should be defined in c++2a"
# endif
# if __cpp_lib_map_try_emplace != 201411L
#   error "__cpp_lib_map_try_emplace should have the value 201411L in c++2a"
# endif

# if !defined(_LIBCPP_VERSION)
#   ifndef __cpp_lib_math_special_functions
#     error "__cpp_lib_math_special_functions should be defined in c++2a"
#   endif
#   if __cpp_lib_math_special_functions != 201603L
#     error "__cpp_lib_math_special_functions should have the value 201603L in c++2a"
#   endif
# else // _LIBCPP_VERSION
#   ifdef __cpp_lib_math_special_functions
#     error "__cpp_lib_math_special_functions should not be defined because it is unimplemented in libc++!"
#   endif
# endif

# if !defined(_LIBCPP_VERSION)
#   ifndef __cpp_lib_memory_resource
#     error "__cpp_lib_memory_resource should be defined in c++2a"
#   endif
#   if __cpp_lib_memory_resource != 201603L
#     error "__cpp_lib_memory_resource should have the value 201603L in c++2a"
#   endif
# else // _LIBCPP_VERSION
#   ifdef __cpp_lib_memory_resource
#     error "__cpp_lib_memory_resource should not be defined because it is unimplemented in libc++!"
#   endif
# endif

# ifndef __cpp_lib_node_extract
#   error "__cpp_lib_node_extract should be defined in c++2a"
# endif
# if __cpp_lib_node_extract != 201606L
#   error "__cpp_lib_node_extract should have the value 201606L in c++2a"
# endif

# ifndef __cpp_lib_nonmember_container_access
#   error "__cpp_lib_nonmember_container_access should be defined in c++2a"
# endif
# if __cpp_lib_nonmember_container_access != 201411L
#   error "__cpp_lib_nonmember_container_access should have the value 201411L in c++2a"
# endif

# ifndef __cpp_lib_not_fn
#   error "__cpp_lib_not_fn should be defined in c++2a"
# endif
# if __cpp_lib_not_fn != 201603L
#   error "__cpp_lib_not_fn should have the value 201603L in c++2a"
# endif

# ifndef __cpp_lib_null_iterators
#   error "__cpp_lib_null_iterators should be defined in c++2a"
# endif
# if __cpp_lib_null_iterators != 201304L
#   error "__cpp_lib_null_iterators should have the value 201304L in c++2a"
# endif

# ifndef __cpp_lib_optional
#   error "__cpp_lib_optional should be defined in c++2a"
# endif
# if __cpp_lib_optional != 201606L
#   error "__cpp_lib_optional should have the value 201606L in c++2a"
# endif

# if !defined(_LIBCPP_VERSION)
#   ifndef __cpp_lib_parallel_algorithm
#     error "__cpp_lib_parallel_algorithm should be defined in c++2a"
#   endif
#   if __cpp_lib_parallel_algorithm != 201603L
#     error "__cpp_lib_parallel_algorithm should have the value 201603L in c++2a"
#   endif
# else // _LIBCPP_VERSION
#   ifdef __cpp_lib_parallel_algorithm
#     error "__cpp_lib_parallel_algorithm should not be defined because it is unimplemented in libc++!"
#   endif
# endif

# ifndef __cpp_lib_quoted_string_io
#   error "__cpp_lib_quoted_string_io should be defined in c++2a"
# endif
# if __cpp_lib_quoted_string_io != 201304L
#   error "__cpp_lib_quoted_string_io should have the value 201304L in c++2a"
# endif

# if !defined(_LIBCPP_VERSION)
#   ifndef __cpp_lib_ranges
#     error "__cpp_lib_ranges should be defined in c++2a"
#   endif
#   if __cpp_lib_ranges != 201811L
#     error "__cpp_lib_ranges should have the value 201811L in c++2a"
#   endif
# else // _LIBCPP_VERSION
#   ifdef __cpp_lib_ranges
#     error "__cpp_lib_ranges should not be defined because it is unimplemented in libc++!"
#   endif
# endif

# ifndef __cpp_lib_raw_memory_algorithms
#   error "__cpp_lib_raw_memory_algorithms should be defined in c++2a"
# endif
# if __cpp_lib_raw_memory_algorithms != 201606L
#   error "__cpp_lib_raw_memory_algorithms should have the value 201606L in c++2a"
# endif

# ifndef __cpp_lib_result_of_sfinae
#   error "__cpp_lib_result_of_sfinae should be defined in c++2a"
# endif
# if __cpp_lib_result_of_sfinae != 201210L
#   error "__cpp_lib_result_of_sfinae should have the value 201210L in c++2a"
# endif

# ifndef __cpp_lib_robust_nonmodifying_seq_ops
#   error "__cpp_lib_robust_nonmodifying_seq_ops should be defined in c++2a"
# endif
# if __cpp_lib_robust_nonmodifying_seq_ops != 201304L
#   error "__cpp_lib_robust_nonmodifying_seq_ops should have the value 201304L in c++2a"
# endif

# ifndef __cpp_lib_sample
#   error "__cpp_lib_sample should be defined in c++2a"
# endif
# if __cpp_lib_sample != 201603L
#   error "__cpp_lib_sample should have the value 201603L in c++2a"
# endif

# ifndef __cpp_lib_scoped_lock
#   error "__cpp_lib_scoped_lock should be defined in c++2a"
# endif
# if __cpp_lib_scoped_lock != 201703L
#   error "__cpp_lib_scoped_lock should have the value 201703L in c++2a"
# endif

# if !defined(_LIBCPP_HAS_NO_THREADS)
#   ifndef __cpp_lib_shared_mutex
#     error "__cpp_lib_shared_mutex should be defined in c++2a"
#   endif
#   if __cpp_lib_shared_mutex != 201505L
#     error "__cpp_lib_shared_mutex should have the value 201505L in c++2a"
#   endif
# else
#   ifdef __cpp_lib_shared_mutex
#     error "__cpp_lib_shared_mutex should not be defined when !defined(_LIBCPP_HAS_NO_THREADS) is not defined!"
#   endif
# endif

# if !defined(_LIBCPP_VERSION)
#   ifndef __cpp_lib_shared_ptr_arrays
#     error "__cpp_lib_shared_ptr_arrays should be defined in c++2a"
#   endif
#   if __cpp_lib_shared_ptr_arrays != 201611L
#     error "__cpp_lib_shared_ptr_arrays should have the value 201611L in c++2a"
#   endif
# else // _LIBCPP_VERSION
#   ifdef __cpp_lib_shared_ptr_arrays
#     error "__cpp_lib_shared_ptr_arrays should not be defined because it is unimplemented in libc++!"
#   endif
# endif

# ifndef __cpp_lib_shared_ptr_weak_type
#   error "__cpp_lib_shared_ptr_weak_type should be defined in c++2a"
# endif
# if __cpp_lib_shared_ptr_weak_type != 201606L
#   error "__cpp_lib_shared_ptr_weak_type should have the value 201606L in c++2a"
# endif

# if !defined(_LIBCPP_HAS_NO_THREADS)
#   ifndef __cpp_lib_shared_timed_mutex
#     error "__cpp_lib_shared_timed_mutex should be defined in c++2a"
#   endif
#   if __cpp_lib_shared_timed_mutex != 201402L
#     error "__cpp_lib_shared_timed_mutex should have the value 201402L in c++2a"
#   endif
# else
#   ifdef __cpp_lib_shared_timed_mutex
#     error "__cpp_lib_shared_timed_mutex should not be defined when !defined(_LIBCPP_HAS_NO_THREADS) is not defined!"
#   endif
# endif

# ifndef __cpp_lib_string_udls
#   error "__cpp_lib_string_udls should be defined in c++2a"
# endif
# if __cpp_lib_string_udls != 201304L
#   error "__cpp_lib_string_udls should have the value 201304L in c++2a"
# endif

# ifndef __cpp_lib_string_view
#   error "__cpp_lib_string_view should be defined in c++2a"
# endif
# if __cpp_lib_string_view != 201606L
#   error "__cpp_lib_string_view should have the value 201606L in c++2a"
# endif

# if !defined(_LIBCPP_VERSION)
#   ifndef __cpp_lib_three_way_comparison
#     error "__cpp_lib_three_way_comparison should be defined in c++2a"
#   endif
#   if __cpp_lib_three_way_comparison != 201711L
#     error "__cpp_lib_three_way_comparison should have the value 201711L in c++2a"
#   endif
# else // _LIBCPP_VERSION
#   ifdef __cpp_lib_three_way_comparison
#     error "__cpp_lib_three_way_comparison should not be defined because it is unimplemented in libc++!"
#   endif
# endif

# if !defined(_LIBCPP_VERSION)
#   ifndef __cpp_lib_to_chars
#     error "__cpp_lib_to_chars should be defined in c++2a"
#   endif
#   if __cpp_lib_to_chars != 201611L
#     error "__cpp_lib_to_chars should have the value 201611L in c++2a"
#   endif
# else // _LIBCPP_VERSION
#   ifdef __cpp_lib_to_chars
#     error "__cpp_lib_to_chars should not be defined because it is unimplemented in libc++!"
#   endif
# endif

# ifndef __cpp_lib_transformation_trait_aliases
#   error "__cpp_lib_transformation_trait_aliases should be defined in c++2a"
# endif
# if __cpp_lib_transformation_trait_aliases != 201304L
#   error "__cpp_lib_transformation_trait_aliases should have the value 201304L in c++2a"
# endif

# ifndef __cpp_lib_transparent_operators
#   error "__cpp_lib_transparent_operators should be defined in c++2a"
# endif
# if __cpp_lib_transparent_operators != 201510L
#   error "__cpp_lib_transparent_operators should have the value 201510L in c++2a"
# endif

# ifndef __cpp_lib_tuple_element_t
#   error "__cpp_lib_tuple_element_t should be defined in c++2a"
# endif
# if __cpp_lib_tuple_element_t != 201402L
#   error "__cpp_lib_tuple_element_t should have the value 201402L in c++2a"
# endif

# ifndef __cpp_lib_tuples_by_type
#   error "__cpp_lib_tuples_by_type should be defined in c++2a"
# endif
# if __cpp_lib_tuples_by_type != 201304L
#   error "__cpp_lib_tuples_by_type should have the value 201304L in c++2a"
# endif

# ifndef __cpp_lib_type_trait_variable_templates
#   error "__cpp_lib_type_trait_variable_templates should be defined in c++2a"
# endif
# if __cpp_lib_type_trait_variable_templates != 201510L
#   error "__cpp_lib_type_trait_variable_templates should have the value 201510L in c++2a"
# endif

# ifndef __cpp_lib_uncaught_exceptions
#   error "__cpp_lib_uncaught_exceptions should be defined in c++2a"
# endif
# if __cpp_lib_uncaught_exceptions != 201411L
#   error "__cpp_lib_uncaught_exceptions should have the value 201411L in c++2a"
# endif

# ifndef __cpp_lib_unordered_map_try_emplace
#   error "__cpp_lib_unordered_map_try_emplace should be defined in c++2a"
# endif
# if __cpp_lib_unordered_map_try_emplace != 201411L
#   error "__cpp_lib_unordered_map_try_emplace should have the value 201411L in c++2a"
# endif

# ifndef __cpp_lib_variant
#   error "__cpp_lib_variant should be defined in c++2a"
# endif
# if __cpp_lib_variant != 201606L
#   error "__cpp_lib_variant should have the value 201606L in c++2a"
# endif

# ifndef __cpp_lib_void_t
#   error "__cpp_lib_void_t should be defined in c++2a"
# endif
# if __cpp_lib_void_t != 201411L
#   error "__cpp_lib_void_t should have the value 201411L in c++2a"
# endif

#endif // TEST_STD_VER > 17

int main(int, char**) { return 0; }