diff options
| author | Marc Mutz <marc.mutz@kdab.com> | 2014-08-18 20:30:55 +0200 |
|---|---|---|
| committer | Marc Mutz <marc.mutz@kdab.com> | 2014-08-28 09:53:03 +0200 |
| commit | 2e3facf41971cc699b2ab9a62ff4da7654ba9497 (patch) | |
| tree | 3611482b52df5985529ad0f5f5c244045bbf72ab /src | |
| parent | f563124eee7e0f58359599a8108ec0fde21477f4 (diff) | |
Micro-optimize QVector::count()
...by instantiating std::count() not with QVector::const_iterator, which is a
class, but with const T*, thus increasing the chance that the instantiation
can be shared with other instantiations in the executable. It might also enable
STL implementations to choose a hand-optimized version of the algorithm for C++
builtin types.
Change-Id: I93df4e58f76838d98b565f229c19e317774b7b4c
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
Diffstat (limited to 'src')
| -rw-r--r-- | src/corelib/tools/qvector.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/src/corelib/tools/qvector.h b/src/corelib/tools/qvector.h index f26d61eb9c..cb4e193ffc 100644 --- a/src/corelib/tools/qvector.h +++ b/src/corelib/tools/qvector.h @@ -810,7 +810,9 @@ bool QVector<T>::contains(const T &t) const template <typename T> int QVector<T>::count(const T &t) const { - return int(std::count(cbegin(), cend(), t)); + const T *b = d->begin(); + const T *e = d->end(); + return int(std::count(b, e, t)); } template <typename T> |