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++ // Copyright (C) 2023 Ahmad Samir <a.samirh78@gmail.com>
++ // Copyright (C) 2023 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
++ // Qt-Security score:significant reason:default
++
++ #ifndef Q20MAP_H
++ #define Q20MAP_H
++
++ #include <QtCore/qtconfigmacros.h>
++
++ #include <map>
++ #if __has_include(<memory_resource>)
++ # include <memory_resource>
++ #endif
++
++ //
++ // W A R N I N G
++ // -------------
++ //
++ // This file is not part of the Qt API. Types and functions defined in this
++ // file can reliably be replaced by their std counterparts, once available.
++ // You may use these definitions in your own code, but be aware that we
++ // will remove them once Qt depends on the C++ version that supports
++ // them in namespace std. There will be NO deprecation warning, the
++ // definitions will JUST go away.
++ //
++ // If you can't agree to these terms, don't use these definitions!
++ //
++ // We mean it.
++ //
++
++ QT_BEGIN_NAMESPACE
++
++ namespace q20 {
++ // like std::erase/std::erase_if for std::map
++ #if defined(__cpp_lib_erase_if) && __cpp_lib_erase_if >= 202002L // the one returning size_type
++ using std::erase_if;
++ #else
++
++ // Make it more specialized than the compiler's, so that our implementation is preferred over
++ // the compiler's (which may be present, but return void instead of the number of erased elements).
++
++ #define MAKE_OVERLOAD(map, allocator) \
++ template <typename Key, typename T, typename Compare, typename Pred> \
++ constexpr typename std::map<Key, T, Compare, std::allocator<std::pair<const Key, T>>>::size_type \
++ erase_if(std::map<Key, T, Compare, std::allocator<std::pair<const Key, T>>> &c, Pred p) \
++ { \
++ const auto origSize = c.size(); \
++ for (auto it = c.begin(), end = c.end(); it != end; /* erasing */) { \
++ if (p(*it)) \
++ it = c.erase(it); \
++ else \
++ ++it; \
++ } \
++ return origSize - c.size(); \
++ } \
++ /* end */
++
++ MAKE_OVERLOAD(map, allocator)
++ MAKE_OVERLOAD(multimap, allocator)
++ #ifdef __cpp_lib_polymorphic_allocator
++ MAKE_OVERLOAD(map, pmr::polymorphic_allocator)
++ MAKE_OVERLOAD(multimap, pmr::polymorphic_allocator)
++ #endif // __cpp_lib_polymorphic_allocator
++
++ #undef MAKE_OVERLOAD
++
++ #endif // __cpp_lib_erase_if
++ } // namespace q20
++
++ QT_END_NAMESPACE
++
++ #endif /* Q20MAP_H */