libcxx/test/std/utilities/optional/optional.object/optional_requires_destructible_object.fail.cpp

//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

// UNSUPPORTED: c++98, c++03, c++11, c++14
// <optional>

// T shall be an object type and shall satisfy the requirements of Destructible

#include <optional>

using std::optional;

struct X
{
private:
    ~X() {}
};

int main()
{
    using std::optional;
    {
        // expected-error@optional:* 2 {{static_assert failed "instantiation of optional with a reference type is ill-formed}}
        optional<int&> opt1;
        optional<int&&> opt2;
    }
    {
        // expected-error@optional:* {{static_assert failed "instantiation of optional with a non-destructible type is ill-formed"}}
        optional<X> opt3;
    }
    {
        // expected-error@optional:* {{static_assert failed "instantiation of optional with a non-object type is undefined behavior"}}
        // expected-error@optional:* {{static_assert failed "instantiation of optional with a non-destructible type is ill-formed}}
        optional<void()> opt4;
    }
    {
        // expected-error@optional:* {{static_assert failed "instantiation of optional with a non-object type is undefined behavior"}}
        // expected-error@optional:* {{static_assert failed "instantiation of optional with a non-destructible type is ill-formed}}
        // expected-error@optional:* 1+ {{cannot form a reference to 'void'}}
        optional<const void> opt4;
    }
    // FIXME these are garbage diagnostics that Clang should not produce
    // expected-error@optional:* 0+ {{is not a base class}}
}