mirror of
https://github.com/crystalidea/qt6windows7.git
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85 lines
2.6 KiB
C++
85 lines
2.6 KiB
C++
// Copyright (C) 2022 The Qt Company Ltd.
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// Copyright (C) 2019 Intel Corporation.
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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 QFOREACH_H
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#define QFOREACH_H
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#include <QtCore/qtclasshelpermacros.h>
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#include <QtCore/qtconfigmacros.h>
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#include <QtCore/qtdeprecationmarkers.h>
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#include <QtCore/qttypetraits.h>
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QT_BEGIN_NAMESPACE
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#if 0
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#pragma qt_class(QForeach)
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#pragma qt_sync_stop_processing
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#endif
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#ifndef QT_NO_FOREACH
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namespace QtPrivate {
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template <typename T>
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class QForeachContainer {
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Q_DISABLE_COPY_MOVE(QForeachContainer)
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public:
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QForeachContainer(const T &t) : c(t), i(std::as_const(c).begin()), e(std::as_const(c).end()) {}
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QForeachContainer(T &&t) : c(std::move(t)), i(std::as_const(c).begin()), e(std::as_const(c).end()) {}
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T c;
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typename T::const_iterator i, e;
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};
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// Containers that have a detach function are considered shared, and are OK in a foreach loop
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template <typename T, typename = decltype(std::declval<T>().detach())>
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inline void warnIfContainerIsNotShared(int) {}
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#if QT_DEPRECATED_SINCE(6, 0)
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// Other containers will copy themselves if used in foreach, this use is deprecated
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template <typename T>
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QT_DEPRECATED_VERSION_X_6_0("Do not use foreach/Q_FOREACH with containers which are not implicitly shared. "
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"Prefer using a range-based for loop with these containers: `for (const auto &it : container)`, "
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"keeping in mind that range-based for doesn't copy the container as Q_FOREACH does")
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inline void warnIfContainerIsNotShared(...) {}
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#endif
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template<typename T>
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QForeachContainer<typename std::decay<T>::type> qMakeForeachContainer(T &&t)
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{
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warnIfContainerIsNotShared<typename std::decay<T>::type>(0);
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return QForeachContainer<typename std::decay<T>::type>(std::forward<T>(t));
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}
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}
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// Use C++17 if statement with initializer. User's code ends up in a else so
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// scoping of different ifs is not broken
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#define Q_FOREACH_IMPL(variable, name, container) \
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for (auto name = QtPrivate::qMakeForeachContainer(container); name.i != name.e; ++name.i) \
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if (variable = *name.i; false) {} else
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#define Q_FOREACH_JOIN(A, B) Q_FOREACH_JOIN_IMPL(A, B)
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#define Q_FOREACH_JOIN_IMPL(A, B) A ## B
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#define Q_FOREACH(variable, container) \
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Q_FOREACH_IMPL(variable, Q_FOREACH_JOIN(_container_, __LINE__), container)
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#endif // QT_NO_FOREACH
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#define Q_FOREVER for(;;)
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#ifndef QT_NO_KEYWORDS
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# ifndef QT_NO_FOREACH
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# ifndef foreach
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# define foreach Q_FOREACH
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# endif
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# endif // QT_NO_FOREACH
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# ifndef forever
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# define forever Q_FOREVER
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# endif
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#endif
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QT_END_NAMESPACE
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#endif /* QFOREACH_H */
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