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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
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++98, c++03, c++11
// <functional>
// Hashing a struct w/o a defined hash should *not* fail, but it should
// create a type that is not constructible and not callable.
// See also: https://cplusplus.github.io/LWG/lwg-defects.html#2543
#include <functional>
#include <cassert>
#include <type_traits>
#include "test_macros.h"
struct X {};
int main()
{
using H = std::hash<X>;
static_assert(!std::is_default_constructible<H>::value, "");
static_assert(!std::is_copy_constructible<H>::value, "");
static_assert(!std::is_move_constructible<H>::value, "");
static_assert(!std::is_copy_assignable<H>::value, "");
static_assert(!std::is_move_assignable<H>::value, "");
#if TEST_STD_VER > 14
static_assert(!std::is_invocable<H, X&>::value, "");
static_assert(!std::is_invocable<H, X const&>::value, "");
#endif
}
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