104 lines
3.6 KiB
C++
104 lines
3.6 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the QtConcurrent module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 3 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL3 included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 3 requirements
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** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 2.0 or (at your option) the GNU General
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** Public license version 3 or any later version approved by the KDE Free
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** Qt Foundation. The licenses are as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-2.0.html and
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** https://www.gnu.org/licenses/gpl-3.0.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#ifndef QTCONCURRENT_STOREDFUNCTIONCALL_H
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#define QTCONCURRENT_STOREDFUNCTIONCALL_H
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#include <QtConcurrent/qtconcurrent_global.h>
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#ifndef QT_NO_CONCURRENT
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#include <QtConcurrent/qtconcurrentrunbase.h>
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#include <type_traits>
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QT_BEGIN_NAMESPACE
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#ifndef Q_QDOC
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namespace QtConcurrent {
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template <class Function, class ...Args>
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struct InvokeResult
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{
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static_assert(std::is_invocable_v<std::decay_t<Function>, std::decay_t<Args>...>,
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"It's not possible to invoke the function with passed arguments.");
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using Type = std::invoke_result_t<std::decay_t<Function>, std::decay_t<Args>...>;
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};
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template <class Function, class ...Args>
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using InvokeResultType = typename InvokeResult<Function, Args...>::Type;
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template <class ...Types>
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using DecayedTuple = std::tuple<std::decay_t<Types>...>;
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template <class Function, class ...Args>
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struct StoredFunctionCall : public RunFunctionTask<InvokeResultType<Function, Args...>>
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{
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StoredFunctionCall(Function &&f, Args &&...args)
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: data{std::forward<Function>(f), std::forward<Args>(args)...}
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{}
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StoredFunctionCall(DecayedTuple<Function, Args...> &&_data)
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: data(std::move(_data))
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{}
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void runFunctor() override
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{
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constexpr auto invoke = &std::invoke<std::decay_t<Function>,
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std::decay_t<Args>...>;
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if constexpr (std::is_void_v<InvokeResultType<Function, Args...>>)
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std::apply(invoke, std::move(data));
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else
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this->result = std::apply(invoke, std::move(data));
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}
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DecayedTuple<Function, Args...> data;
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};
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} //namespace QtConcurrent
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#endif // Q_QDOC
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QT_END_NAMESPACE
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#endif // QT_NO_CONCURRENT
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#endif
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