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Enhanced QSharedDataPointer documentation with container performance section

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Added a section motivating the use of Q_DECLARE_TYPEINFO to mark
shared data classes as movable types.

Change-Id: I26664500aef7d83d779d90f97f3f2b0043966480
Reviewed-by: Casper van Donderen <casper.vandonderen@gmail.com>
This commit is contained in:
Nils Jeisecke 2012-06-25 19:13:19 +02:00 committed by The Qt Project
parent bad43f1e3d
commit 24539dc3d8
1 changed files with 8 additions and 0 deletions
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src/corelib/tools/qshareddata.cpp
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@ -230,6 +230,14 @@ QT_BEGIN_NAMESPACE
In the member function documentation, \e{d pointer} always refers
to the internal pointer to the shared data object.
\section1 Optimize performance for usage in Qt Containers
You should consider marking your implicitly shared class as a movable type
using the Q_DECLARE_TYPEINFO() macro if it resembles the \c Employee class
above and uses a QSharedDataPointer or QExplicitlySharedDataPointer as the
only member. This can improve performance and memory efficiency when using
Qt's \l{container classes}.
\sa QSharedData, QExplicitlySharedDataPointer, QScopedPointer, QSharedPointer
*/