diff options
author | Marc Mutz <marc.mutz@kdab.com> | 2014-10-01 10:10:49 +0200 |
---|---|---|
committer | Marc Mutz <marc.mutz@kdab.com> | 2014-10-01 18:25:52 +0200 |
commit | db1db22818949ed112a7208b6063b208952e95ea (patch) | |
tree | 1ccadac9806a01dcdb3c040e2fd2e85090fb1329 /src/corelib/tools/qvector.h | |
parent | 5e01d3f64265867284e6bba8d1881e10c5d7605c (diff) |
QVector: iterate forward in operator==
After much head-scratching, we found no reason for the backwards iteration.
Indeed, forward iteration should be slightly faster than backwards, because
it operates in the direction in which cache-lines are filled, usually.
This is in preparation of using std algorithms instead of hand-written
loops. It avoids having to use std::reverse_iterator.
Change-Id: I180c52e0bb90e823216b77d3f49f2a3fd395567d
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Diffstat (limited to 'src/corelib/tools/qvector.h')
-rw-r--r-- | src/corelib/tools/qvector.h | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/src/corelib/tools/qvector.h b/src/corelib/tools/qvector.h index 07c66bc393..83b836711d 100644 --- a/src/corelib/tools/qvector.h +++ b/src/corelib/tools/qvector.h @@ -707,11 +707,11 @@ bool QVector<T>::operator==(const QVector<T> &v) const return true; if (d->size != v.d->size) return false; - T* b = d->begin(); - T* i = b + d->size; - T* j = v.d->end(); - while (i != b) - if (!(*--i == *--j)) + T* e = d->end(); + T* i = d->begin(); + T* vi = v.d->begin(); + for (; i != e; ++i, ++vi) + if (!(*i == *vi)) return false; return true; } |