diff options
Diffstat (limited to 'src/corelib/tools/qversionnumber.h')
| -rw-r--r-- | src/corelib/tools/qversionnumber.h | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/src/corelib/tools/qversionnumber.h b/src/corelib/tools/qversionnumber.h index d43b86ba51..03a27548b8 100644 --- a/src/corelib/tools/qversionnumber.h +++ b/src/corelib/tools/qversionnumber.h @@ -309,8 +309,159 @@ Q_REQUIRED_RESULT inline bool operator==(const QVersionNumber &lhs, const QVersi Q_REQUIRED_RESULT inline bool operator!=(const QVersionNumber &lhs, const QVersionNumber &rhs) noexcept { return QVersionNumber::compare(lhs, rhs) != 0; } +class QTypeRevision; +Q_CORE_EXPORT uint qHash(const QTypeRevision &key, uint seed = 0); + +#ifndef QT_NO_DATASTREAM +Q_CORE_EXPORT QDataStream& operator<<(QDataStream &out, const QTypeRevision &revision); +Q_CORE_EXPORT QDataStream& operator>>(QDataStream &in, QTypeRevision &revision); +#endif + +class QTypeRevision +{ +public: + template<typename Integer> + using if_valid_segment_type = typename std::enable_if< + std::is_integral<Integer>::value, bool>::type; + + template<typename Integer> + using if_valid_value_type = typename std::enable_if< + std::is_integral<Integer>::value + && (sizeof(Integer) > sizeof(quint16) + || (sizeof(Integer) == sizeof(quint16) + && !std::is_signed<Integer>::value)), bool>::type; + + template<typename Integer, if_valid_segment_type<Integer> = true> + static constexpr bool isValidSegment(Integer segment) + { + return segment >= Integer(0) && segment < Integer(SegmentUnknown); + } + + static constexpr bool isValidSegment(qint8 segment) { return segment >= 0; } + + template<typename Major, typename Minor, + if_valid_segment_type<Major> = true, + if_valid_segment_type<Minor> = true> + static constexpr QTypeRevision fromVersion(Major majorVersion, Minor minorVersion) + { + return Q_ASSERT(isValidSegment(majorVersion)), + Q_ASSERT(isValidSegment(minorVersion)), + QTypeRevision(quint8(majorVersion), quint8(minorVersion)); + } + + template<typename Major, if_valid_segment_type<Major> = true> + static constexpr QTypeRevision fromMajorVersion(Major majorVersion) + { + return Q_ASSERT(isValidSegment(majorVersion)), + QTypeRevision(quint8(majorVersion), SegmentUnknown); + } + + template<typename Minor, if_valid_segment_type<Minor> = true> + static constexpr QTypeRevision fromMinorVersion(Minor minorVersion) + { + return Q_ASSERT(isValidSegment(minorVersion)), + QTypeRevision(SegmentUnknown, quint8(minorVersion)); + } + + template<typename Integer, if_valid_value_type<Integer> = true> + static constexpr QTypeRevision fromEncodedVersion(Integer value) + { + return Q_ASSERT((value & ~Integer(0xffff)) == Integer(0)), + QTypeRevision((value & Integer(0xff00)) >> 8, value & Integer(0xff)); + } + + static constexpr QTypeRevision zero() { return QTypeRevision(0, 0); } + + constexpr QTypeRevision() = default; + + constexpr bool hasMajorVersion() const { return m_majorVersion != SegmentUnknown; } + constexpr quint8 majorVersion() const { return m_majorVersion; } + + constexpr bool hasMinorVersion() const { return m_minorVersion != SegmentUnknown; } + constexpr quint8 minorVersion() const { return m_minorVersion; } + + constexpr bool isValid() const { return hasMajorVersion() || hasMinorVersion(); } + + template<typename Integer, if_valid_value_type<Integer> = true> + constexpr Integer toEncodedVersion() const + { + return Integer(m_majorVersion << 8) | Integer(m_minorVersion); + } + +private: + enum { SegmentUnknown = quint8(~0U) }; + +#if Q_BYTE_ORDER == Q_LITTLE_ENDIAN + constexpr QTypeRevision(quint8 major, quint8 minor) + : m_minorVersion(minor), m_majorVersion(major) {} + + quint8 m_minorVersion = SegmentUnknown; + quint8 m_majorVersion = SegmentUnknown; +#else + constexpr QTypeRevision(quint8 major, quint8 minor) + : m_majorVersion(major), m_minorVersion(minor) {} + + quint8 m_majorVersion = SegmentUnknown; + quint8 m_minorVersion = SegmentUnknown; +#endif +}; + +inline constexpr bool operator==(QTypeRevision lhs, QTypeRevision rhs) +{ + return lhs.toEncodedVersion<quint16>() == rhs.toEncodedVersion<quint16>(); +} + +inline constexpr bool operator!=(QTypeRevision lhs, QTypeRevision rhs) +{ + return lhs.toEncodedVersion<quint16>() != rhs.toEncodedVersion<quint16>(); +} + +inline constexpr bool operator<(QTypeRevision lhs, QTypeRevision rhs) +{ + return (!lhs.hasMajorVersion() && rhs.hasMajorVersion()) + // non-0 major > unspecified major > major 0 + ? rhs.majorVersion() != 0 + : ((lhs.hasMajorVersion() && !rhs.hasMajorVersion()) + // major 0 < unspecified major < non-0 major + ? lhs.majorVersion() == 0 + : (lhs.majorVersion() != rhs.majorVersion() + // both majors specified and non-0 + ? lhs.majorVersion() < rhs.majorVersion() + : ((!lhs.hasMinorVersion() && rhs.hasMinorVersion()) + // non-0 minor > unspecified minor > minor 0 + ? rhs.minorVersion() != 0 + : ((lhs.hasMinorVersion() && !rhs.hasMinorVersion()) + // minor 0 < unspecified minor < non-0 minor + ? lhs.minorVersion() == 0 + // both minors specified and non-0 + : lhs.minorVersion() < rhs.minorVersion())))); +} + +inline constexpr bool operator>(QTypeRevision lhs, QTypeRevision rhs) +{ + return lhs != rhs && !(lhs < rhs); +} + +inline constexpr bool operator<=(QTypeRevision lhs, QTypeRevision rhs) +{ + return lhs == rhs || lhs < rhs; +} + +inline constexpr bool operator>=(QTypeRevision lhs, QTypeRevision rhs) +{ + return lhs == rhs || !(lhs < rhs); +} + +Q_STATIC_ASSERT(sizeof(QTypeRevision) == 2); +Q_DECLARE_TYPEINFO(QTypeRevision, Q_MOVABLE_TYPE); + +#ifndef QT_NO_DEBUG_STREAM +Q_CORE_EXPORT QDebug operator<<(QDebug, const QTypeRevision &revision); +#endif + QT_END_NAMESPACE Q_DECLARE_METATYPE(QVersionNumber) +Q_DECLARE_METATYPE(QTypeRevision) #endif //QVERSIONNUMBER_H |