12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849 | // Copyright (C) 2022 The Qt Company Ltd.// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only#ifndef Q23FUNCTIONAL_H#define Q23FUNCTIONAL_H#include <QtCore/qglobal.h>#include <QtCore/q20functional.h>//// W A R N I N G// -------------//// This file is not part of the Qt API. Types and functions defined in this// file can reliably be replaced by their std counterparts, once available.// You may use these definitions in your own code, but be aware that we// will remove them once Qt depends on the C++ version that supports// them in namespace std. There will be NO deprecation warning, the// definitions will JUST go away.//// If you can't agree to these terms, don't use these definitions!//// We mean it.// QT_BEGIN_NAMESPACE namespace q23 {// like std::invoke_r#ifdef __cpp_lib_invoke_rusingstd::invoke_r;#elsetemplate<typename R, typename F, typename...Args>constexprstd::enable_if_t<std::is_invocable_r_v<R, F, Args...>, R>invoke_r(F&& f, Args&&... args)noexcept(std::is_nothrow_invocable_r_v<R, F, Args...>){// ### use q20::invoke for a constexpr std::invokeifconstexpr(std::is_void_v<R>)std::invoke(std::forward<F>(f),std::forward<Args>(args)...);elsereturnstd::invoke(std::forward<F>(f),std::forward<Args>(args)...);}#endif// __cpp_lib_invoke_r}// namespace q23 QT_END_NAMESPACE #endif/* Q23FUNCTIONAL_H */
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