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Diffstat (limited to 'src/corelib/global/qminmax.h')
-rw-r--r-- | src/corelib/global/qminmax.h | 88 |
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 |