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QDuplicateTracker: allow usage of qHash

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The codepath using unordered_set forced the usage of std::hash,
which isn't provided by many Qt types. Instead, use the
brand new helpers in QHash that dispatch to qHash with a fallback
on std::hash.

Change-Id: I9185fe9c52de05c470afe7466007591977e65bb1
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
This commit is contained in:
Giuseppe D'Angelo 2020-12-02 18:06:24 +01:00
parent 7a32a2d809
commit 06957af471
1 changed files with 9 additions and 1 deletions
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10
src/corelib/tools/qduplicatetracker_p.h
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@ -55,6 +55,7 @@
#if QT_HAS_INCLUDE(<memory_resource>) && __cplusplus > 201402L
# include <unordered_set>
# include <memory_resource>
# include <qhash.h> // for the hashing helpers
#else
# include <qset.h>
#endif
@ -64,9 +65,16 @@ QT_BEGIN_NAMESPACE
template <typename T, size_t Prealloc = 32>
class QDuplicateTracker {
#ifdef __cpp_lib_memory_resource
template <typename HT>
struct QHasher {
size_t operator()(const HT &t) const {
return QHashPrivate::calculateHash(t, qGlobalQHashSeed());
}
};
char buffer[Prealloc * sizeof(T)];
std::pmr::monotonic_buffer_resource res{buffer, sizeof buffer};
std::pmr::unordered_set<T> set{&res};
std::pmr::unordered_set<T, QHasher<T>> set{&res};
#else
QSet<T> set;
int setSize = 0;