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