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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++03, c++11, c++14, c++17, c++20, c++23
// <functional>
// template<auto f> constexpr unspecified not_fn() noexcept;
// Mandates: If is_pointer_v<F> || is_member_pointer_v<F> is true, then f != nullptr is true.
#include <functional>
struct X {};
void test() {
auto not_fn1 = std::not_fn<static_cast<bool (*)()>(nullptr)>();
// expected-error@*:* {{static assertion failed due to requirement 'nullptr != nullptr': f cannot be equal to nullptr}}
auto not_fn2 = std::not_fn<static_cast<bool X::*>(nullptr)>();
// expected-error@*:* {{static assertion failed due to requirement 'nullptr != nullptr': f cannot be equal to nullptr}}
auto not_fn3 = std::not_fn<static_cast<bool (X::*)()>(nullptr)>();
// expected-error@*:* {{static assertion failed due to requirement 'nullptr != nullptr': f cannot be equal to nullptr}}
}
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