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- //===----------------------------------------------------------------------===//
- //
- // 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
- //
- //===----------------------------------------------------------------------===//
- // <iterator>
- // All of these became constexpr in C++17
- //
- // template <InputIterator Iter>
- // constexpr void advance(Iter& i, Iter::difference_type n);
- //
- // template <BidirectionalIterator Iter>
- // constexpr void advance(Iter& i, Iter::difference_type n);
- //
- // template <RandomAccessIterator Iter>
- // constexpr void advance(Iter& i, Iter::difference_type n);
- #include <iterator>
- #include <cassert>
- #include "test_macros.h"
- #include "test_iterators.h"
- template <class It>
- void
- test(It i, typename std::iterator_traits<It>::difference_type n, It x)
- {
- std::advance(i, n);
- assert(i == x);
- }
- #if TEST_STD_VER > 14
- template <class It>
- constexpr bool
- constepxr_test(It i, typename std::iterator_traits<It>::difference_type n, It x)
- {
- std::advance(i, n);
- return i == x;
- }
- #endif
- int main(int, char**)
- {
- {
- const char* s = "1234567890";
- test(input_iterator<const char*>(s), 10, input_iterator<const char*>(s+10));
- test(forward_iterator<const char*>(s), 10, forward_iterator<const char*>(s+10));
- test(bidirectional_iterator<const char*>(s+5), 5, bidirectional_iterator<const char*>(s+10));
- test(bidirectional_iterator<const char*>(s+5), -5, bidirectional_iterator<const char*>(s));
- test(random_access_iterator<const char*>(s+5), 5, random_access_iterator<const char*>(s+10));
- test(random_access_iterator<const char*>(s+5), -5, random_access_iterator<const char*>(s));
- test(s+5, 5, s+10);
- test(s+5, -5, s);
- }
- #if TEST_STD_VER > 14
- {
- constexpr const char* s = "1234567890";
- static_assert( constepxr_test(input_iterator<const char*>(s), 10, input_iterator<const char*>(s+10)), "" );
- static_assert( constepxr_test(forward_iterator<const char*>(s), 10, forward_iterator<const char*>(s+10)), "" );
- static_assert( constepxr_test(bidirectional_iterator<const char*>(s+5), 5, bidirectional_iterator<const char*>(s+10)), "" );
- static_assert( constepxr_test(bidirectional_iterator<const char*>(s+5), -5, bidirectional_iterator<const char*>(s)), "" );
- static_assert( constepxr_test(random_access_iterator<const char*>(s+5), 5, random_access_iterator<const char*>(s+10)), "" );
- static_assert( constepxr_test(random_access_iterator<const char*>(s+5), -5, random_access_iterator<const char*>(s)), "" );
- static_assert( constepxr_test(s+5, 5, s+10), "" );
- static_assert( constepxr_test(s+5, -5, s), "" );
- }
- #endif
- return 0;
- }
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