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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtConcurrent module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QTCONCURRENT_FUNCTIONWRAPPERS_H
#define QTCONCURRENT_FUNCTIONWRAPPERS_H
#include <QtConcurrent/qtconcurrentcompilertest.h>
#include <QtCore/qfuture.h>
#include <tuple>
#if !defined(QT_NO_CONCURRENT) || defined(Q_CLANG_QDOC)
QT_BEGIN_NAMESPACE
namespace QtPrivate {
struct PushBackWrapper
{
template <class C, class U>
inline void operator()(C &c, const U &u) const
{
return c.push_back(u);
}
template <class C, class U>
inline void operator()(C &c, U &&u) const
{
return c.push_back(u);
}
};
// -- MapResultType
template <class T, class Enable = void>
struct Argument
{
using Type = void;
};
template <class Sequence>
struct Argument<Sequence, typename std::enable_if<IsIterableValue<Sequence>>::type>
{
using Type = std::decay_t<decltype(*std::declval<Sequence>().begin())>;
};
template <class Iterator>
struct Argument<Iterator, typename std::enable_if<IsDereferenceableValue<Iterator>>::type>
{
using Type = std::decay_t<decltype(*std::declval<Iterator>())>;
};
template <class T>
using ArgumentType = typename Argument<T>::Type;
template <class T, class MapFunctor>
struct MapResult
{
static_assert(std::is_invocable_v<std::decay_t<MapFunctor>, ArgumentType<T>>,
"It's not possible to invoke the function with passed argument.");
using Type = std::invoke_result_t<std::decay_t<MapFunctor>, ArgumentType<T>>;
};
template <class T, class MapFunctor>
using MapResultType = typename MapResult<T, MapFunctor>::Type;
// -- ReduceResultType
template <class T>
struct ReduceResultType;
template <class U, class V>
struct ReduceResultType<void(*)(U&,V)>
{
using ResultType = U;
};
template <class T, class C, class U>
struct ReduceResultType<T(C::*)(U)>
{
using ResultType = C;
};
template <class U, class V>
struct ReduceResultType<std::function<void(U&, V)>>
{
using ResultType = U;
};
template <typename R, typename ...A>
struct ReduceResultType<R(*)(A...)>
{
using ResultType = typename std::tuple_element<0, std::tuple<A...>>::type;
};
template <class U, class V>
struct ReduceResultType<void(*)(U&,V) noexcept>
{
using ResultType = U;
};
template <class T, class C, class U>
struct ReduceResultType<T(C::*)(U) noexcept>
{
using ResultType = C;
};
template<class T, class Enable = void>
inline constexpr bool hasCallOperator_v = false;
template<class T>
inline constexpr bool hasCallOperator_v<T, std::void_t<decltype(&T::operator())>> = true;
template<class T, class Enable = void>
inline constexpr bool isIterator_v = false;
template<class T>
inline constexpr bool isIterator_v<T, std::void_t<typename std::iterator_traits<T>::value_type>> =
true;
template <class Callable, class Sequence>
using isInvocable = std::is_invocable<Callable, typename std::decay_t<Sequence>::value_type>;
template<class Callable, class Enable = void>
struct ReduceResultTypeHelper
{
};
template <class Callable>
struct ReduceResultTypeHelper<Callable,
typename std::enable_if_t<std::is_function_v<std::remove_pointer_t<std::decay_t<Callable>>>
|| std::is_member_function_pointer_v<std::decay_t<Callable>>>>
{
using type = typename QtPrivate::ReduceResultType<std::decay_t<Callable>>::ResultType;
};
template <class Callable>
struct ReduceResultTypeHelper<Callable,
typename std::enable_if_t<!std::is_function_v<std::remove_pointer_t<std::decay_t<Callable>>>
&& hasCallOperator_v<std::decay_t<Callable>>>>
{
using type = std::decay_t<typename QtPrivate::ArgResolver<Callable>::First>;
};
// -- MapSequenceResultType
template <class InputSequence, class MapFunctor>
struct MapSequenceResultType
{
static_assert(std::is_same_v<typename InputSequence::value_type,
QtPrivate::MapResultType<InputSequence, MapFunctor>>,
"Couldn't deduce the output sequence type, you must specify it explicitly.");
typedef InputSequence ResultType;
};
#ifndef QT_NO_TEMPLATE_TEMPLATE_PARAMETERS
template <template <typename...> class InputSequence, typename MapFunctor, typename ...T>
struct MapSequenceResultType<InputSequence<T...>, MapFunctor>
{
typedef InputSequence<QtPrivate::MapResultType<InputSequence<T...>, MapFunctor>> ResultType;
};
#endif // QT_NO_TEMPLATE_TEMPLATE_PARAMETER
template<typename Sequence>
struct SequenceHolder
{
SequenceHolder(const Sequence &s) : sequence(s) { }
SequenceHolder(Sequence &&s) : sequence(std::move(s)) { }
Sequence sequence;
};
} // namespace QtPrivate.
QT_END_NAMESPACE
#endif // QT_NO_CONCURRENT
#endif
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