1 files changed, 88 insertions, 0 deletions
diff --git a/src/corelib/global/qminmax.h b/src/corelib/global/qminmax.h
new file mode 100644
index 0000000000..e6fb62bf9d
--- /dev/null
+++ b/src/corelib/global/qminmax.h
@@ -0,0 +1,88 @@
+// Copyright (C) 2022 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
+
+#ifndef QMINMAX_H
+#define QMINMAX_H
+
+#if 0
+#pragma qt_class(QtMinMax)
+#pragma qt_sync_stop_processing
+#endif
+
+#include <QtCore/qassert.h>
+#include <QtCore/qtconfigmacros.h>
+
+#include <type_traits>
+
+QT_BEGIN_NAMESPACE
+
+namespace QTypeTraits {
+
+namespace detail {
+template<typename T, typename U,
+         typename = std::enable_if_t<std::is_arithmetic_v<T> && std::is_arithmetic_v<U> &&
+                                     std::is_floating_point_v<T> == std::is_floating_point_v<U> &&
+                                     std::is_signed_v<T> == std::is_signed_v<U> &&
+                                     !std::is_same_v<T, bool> && !std::is_same_v<U, bool> &&
+                                     !std::is_same_v<T, char> && !std::is_same_v<U, char>>>
+struct Promoted
+{
+    using type = decltype(T() + U());
+};
+}
+
+template <typename T, typename U>
+using Promoted = typename detail::Promoted<T, U>::type;
+
+}
+
+template <typename T>
+constexpr inline const T &qMin(const T &a, const T &b) { return (a < b) ? a : b; }
+template <typename T>
+constexpr inline const T &qMax(const T &a, const T &b) { return (a < b) ? b : a; }
+template <typename T>
+constexpr inline const T &qBound(const T &min, const T &val, const T &max)
+{
+    Q_ASSERT(!(max < min));
+    return qMax(min, qMin(max, val));
+}
+template <typename T, typename U>
+constexpr inline QTypeTraits::Promoted<T, U> qMin(const T &a, const U &b)
+{
+    using P = QTypeTraits::Promoted<T, U>;
+    P _a = a;
+    P _b = b;
+    return (_a < _b) ? _a : _b;
+}
+template <typename T, typename U>
+constexpr inline QTypeTraits::Promoted<T, U> qMax(const T &a, const U &b)
+{
+    using P = QTypeTraits::Promoted<T, U>;
+    P _a = a;
+    P _b = b;
+    return (_a < _b) ? _b : _a;
+}
+template <typename T, typename U>
+constexpr inline QTypeTraits::Promoted<T, U> qBound(const T &min, const U &val, const T &max)
+{
+    Q_ASSERT(!(max < min));
+    return qMax(min, qMin(max, val));
+}
+template <typename T, typename U>
+constexpr inline QTypeTraits::Promoted<T, U> qBound(const T &min, const T &val, const U &max)
+{
+    using P = QTypeTraits::Promoted<T, U>;
+    Q_ASSERT(!(P(max) < P(min)));
+    return qMax(min, qMin(max, val));
+}
+template <typename T, typename U>
+constexpr inline QTypeTraits::Promoted<T, U> qBound(const U &min, const T &val, const T &max)
+{
+    using P = QTypeTraits::Promoted<T, U>;
+    Q_ASSERT(!(P(max) < P(min)));
+    return qMax(min, qMin(max, val));
+}
+
+QT_END_NAMESPACE
+
+#endif // QMINMAX_H