1 files changed, 90 insertions, 0 deletions
diff --git a/src/corelib/global/q20vector.h b/src/corelib/global/q20vector.h
new file mode 100644
index 0000000000..9d312355ea
--- /dev/null
+++ b/src/corelib/global/q20vector.h
@@ -0,0 +1,90 @@
+// Copyright (C) 2023 Ahmad Samir <a.samirh78@gmail.com>
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#ifndef Q20VECTOR_H
+#define Q20VECTOR_H
+
+#include <QtCore/qtconfigmacros.h>
+
+#include <algorithm>
+#include <vector>
+#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::vector
+#if defined(__cpp_lib_erase_if) && __cpp_lib_erase_if >= 202002L // the one returning size_type
+using std::erase;
+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).
+
+template <typename T, typename U>
+constexpr typename std::vector<T, std::allocator<T>>::size_type
+erase(std::vector<T, std::allocator<T>> &c, const U &value)
+{
+    const auto origSize = c.size();
+    auto it = std::remove(c.begin(), c.end(), value);
+    c.erase(it, c.end());
+    return origSize - c.size();
+}
+
+template <typename T, typename Pred>
+constexpr typename std::vector<T, std::allocator<T>>::size_type
+erase_if(std::vector<T, std::allocator<T>> &c, Pred pred)
+{
+    const auto origSize = c.size();
+    auto it = std::remove_if(c.begin(), c.end(), pred);
+    c.erase(it, c.end());
+    return origSize - c.size();
+}
+
+#ifdef __cpp_lib_polymorphic_allocator
+template <typename T, typename U>
+constexpr typename std::vector<T, std::pmr::polymorphic_allocator<T>>::size_type
+erase(std::vector<T, std::pmr::polymorphic_allocator<T>> &c, const U &value)
+{
+    const auto origSize = c.size();
+    auto it = std::remove(c.begin(), c.end(), value);
+    c.erase(it, c.end());
+    return origSize - c.size();
+}
+
+template <typename T, typename Pred>
+constexpr typename std::vector<T, std::pmr::polymorphic_allocator<T>>::size_type
+erase_if(std::vector<T, std::pmr::polymorphic_allocator<T>> &c, Pred pred)
+{
+    const auto origSize = c.size();
+    auto it = std::remove_if(c.begin(), c.end(), pred);
+    c.erase(it, c.end());
+    return origSize - c.size();
+}
+#endif // __cpp_lib_polymorphic_allocator
+
+#endif // __cpp_lib_erase_if
+} // namespace q20
+
+QT_END_NAMESPACE
+
+#endif /* Q20VECTOR_H */