diff options
Diffstat (limited to 'src/corelib/text/qstring.cpp')
| -rw-r--r-- | src/corelib/text/qstring.cpp | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/src/corelib/text/qstring.cpp b/src/corelib/text/qstring.cpp index d9e89f8e5b..70f17ee290 100644 --- a/src/corelib/text/qstring.cpp +++ b/src/corelib/text/qstring.cpp @@ -2054,16 +2054,15 @@ void qtWarnAboutInvalidRegularExpression(const QString &pattern, const char *whe \snippet qstring/stringbuilder.cpp 0 There is nothing wrong with either of these string constructions, - but there are a few hidden inefficiencies. Beginning with Qt 4.6, - you can eliminate them. + but there are a few hidden inefficiencies: First, multiple uses of the \c{'+'} operator usually means multiple memory allocations. When concatenating \e{n} substrings, where \e{n > 2}, there can be as many as \e{n - 1} calls to the memory allocator. - In 4.6, an internal template class \c{QStringBuilder} has been - added along with a few helper functions. This class is marked + These allocations can be optimized by an internal class + \c{QStringBuilder}. This class is marked internal and does not appear in the documentation, because you aren't meant to instantiate it in your code. Its use will be automatic, as described below. The class is found in |