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totally_ordered_wrapper: add swap and qHash overloads; std::hash specialization

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Pointers have these.

We also have qt_ptr_hash for raw pointers, so add an ADL overload for
that, too.

Don't provide a member-swap, since raw pointers don't have that.

Change-Id: I1517588d2ff1aa5caf06ad5861ff09d5e7652183
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>
This commit is contained in:
Marc Mutz 2024-05-29 08:40:49 +02:00
parent d397ae4c06
commit 5831c31235
1 changed files with 18 additions and 1 deletions
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19
src/corelib/global/qcomparehelpers.h
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@ -23,7 +23,7 @@
#endif #endif
#include <QtCore/q20type_traits.h> #include <QtCore/q20type_traits.h>
#include <functional> // std::less #include <functional> // std::less, std::hash
QT_BEGIN_NAMESPACE QT_BEGIN_NAMESPACE
@ -653,10 +653,27 @@ private:
MAKE_RELOP(auto, <=>, compare_three_way) MAKE_RELOP(auto, <=>, compare_three_way)
#endif #endif
#undef MAKE_RELOP #undef MAKE_RELOP
friend void qt_ptr_swap(totally_ordered_wrapper &lhs, totally_ordered_wrapper &rhs) noexcept
{ qt_ptr_swap(lhs.ptr, rhs.ptr); }
friend void swap(totally_ordered_wrapper &lhs, totally_ordered_wrapper &rhs) noexcept
{ qt_ptr_swap(lhs, rhs); }
friend size_t qHash(totally_ordered_wrapper key, size_t seed = 0) noexcept
{ return qHash(key.ptr, seed); }
}; };
} //Qt } //Qt
QT_END_NAMESPACE QT_END_NAMESPACE
namespace std {
template <typename P>
struct hash<QT_PREPEND_NAMESPACE(Qt::totally_ordered_wrapper)<P>>
{
using argument_type = QT_PREPEND_NAMESPACE(Qt::totally_ordered_wrapper)<P>;
using result_type = size_t;
constexpr result_type operator()(argument_type w) const noexcept
{ return std::hash<P>{}(w.get()); }
};
}
#endif // QCOMPAREHELPERS_H #endif // QCOMPAREHELPERS_H