diff options
Diffstat (limited to 'src/corelib/global/qcomparehelpers.h')
| -rw-r--r-- | src/corelib/global/qcomparehelpers.h | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/src/corelib/global/qcomparehelpers.h b/src/corelib/global/qcomparehelpers.h index d0991e91b3..9c9da2c7d9 100644 --- a/src/corelib/global/qcomparehelpers.h +++ b/src/corelib/global/qcomparehelpers.h @@ -21,11 +21,40 @@ #ifdef __cpp_lib_three_way_comparison #include <compare> #endif +#include <QtCore/q20type_traits.h> #include <functional> // std::less QT_BEGIN_NAMESPACE +namespace QtOrderingPrivate { +#ifdef __cpp_lib_three_way_comparison + +template <typename QtOrdering> struct StdOrdering; +template <typename StdOrdering> struct QtOrdering; + +#define QT_STD_MAP(x) \ + template <> struct StdOrdering< Qt::x##_ordering> : q20::type_identity<std::x##_ordering> {};\ + template <> struct StdOrdering<std::x##_ordering> : q20::type_identity<std::x##_ordering> {};\ + template <> struct QtOrdering<std::x##_ordering> : q20::type_identity< Qt::x##_ordering> {};\ + template <> struct QtOrdering< Qt::x##_ordering> : q20::type_identity< Qt::x##_ordering> {};\ + /* end */ +QT_STD_MAP(partial) +QT_STD_MAP(weak) +QT_STD_MAP(strong) +#undef QT_STD_MAP + +template <typename In> constexpr auto to_std(In in) noexcept + -> typename QtOrderingPrivate::StdOrdering<In>::type +{ return in; } + +template <typename In> constexpr auto to_Qt(In in) noexcept + -> typename QtOrderingPrivate::QtOrdering<In>::type +{ return in; } + +#endif // __cpp_lib_three_way_comparison +} // namespace QtOrderingPrivate + /* For all the macros these parameter names are used: * LeftType - the type of the left operand of the comparison |