73 lines
2.2 KiB
C++
73 lines
2.2 KiB
C++
// Copyright (C) 2023 Ahmad Samir <[email protected]>
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// Copyright (C) 2023 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 Q20MAP_H
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#define Q20MAP_H
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#include <QtCore/qtconfigmacros.h>
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#include <map>
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#if __has_include(<memory_resource>)
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# include <memory_resource>
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#endif
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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 q20 {
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// like std::erase/std::erase_if for std::map
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#if defined(__cpp_lib_erase_if) && __cpp_lib_erase_if >= 202002L // the one returning size_type
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using std::erase_if;
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#else
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// Make it more specialized than the compiler's, so that our implementation is preferred over
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// the compiler's (which may be present, but return void instead of the number of erased elements).
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#define MAKE_OVERLOAD(map, allocator) \
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template <typename Key, typename T, typename Compare, typename Pred> \
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constexpr typename std::map<Key, T, Compare, std::allocator<std::pair<const Key, T>>>::size_type \
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erase_if(std::map<Key, T, Compare, std::allocator<std::pair<const Key, T>>> &c, Pred p) \
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{ \
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const auto origSize = c.size(); \
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for (auto it = c.begin(), end = c.end(); it != end; /* erasing */) { \
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if (p(*it)) \
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it = c.erase(it); \
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else \
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++it; \
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} \
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return origSize - c.size(); \
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} \
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/* end */
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MAKE_OVERLOAD(map, allocator)
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MAKE_OVERLOAD(multimap, allocator)
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#ifdef __cpp_lib_polymorphic_allocator
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MAKE_OVERLOAD(map, pmr::polymorphic_allocator)
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MAKE_OVERLOAD(multimap, pmr::polymorphic_allocator)
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#endif // __cpp_lib_polymorphic_allocator
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#undef MAKE_OVERLOAD
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#endif // __cpp_lib_erase_if
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} // namespace q20
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QT_END_NAMESPACE
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#endif /* Q20MAP_H */
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