30 lines
1.2 KiB
C++
30 lines
1.2 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20, c++23
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// <functional>
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// template<auto f> constexpr unspecified not_fn() noexcept;
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// Mandates: If is_pointer_v<F> || is_member_pointer_v<F> is true, then f != nullptr is true.
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#include <functional>
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struct X {};
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void test() {
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auto not_fn1 = std::not_fn<static_cast<bool (*)()>(nullptr)>();
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// expected-error@*:* {{static assertion failed due to requirement 'nullptr != nullptr': f cannot be equal to nullptr}}
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auto not_fn2 = std::not_fn<static_cast<bool X::*>(nullptr)>();
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// expected-error@*:* {{static assertion failed due to requirement 'nullptr != nullptr': f cannot be equal to nullptr}}
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auto not_fn3 = std::not_fn<static_cast<bool (X::*)()>(nullptr)>();
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// expected-error@*:* {{static assertion failed due to requirement 'nullptr != nullptr': f cannot be equal to nullptr}}
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}
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