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79 lines
3.5 KiB
79 lines
3.5 KiB
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<title>Qt Object Model</title>
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<font color="#004faf">Home</font></a>
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<font color="#004faf">All Classes</font></a>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>Qt Object Model</h1>
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<p> The standard C++ Object Model provides very efficient runtime support
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for the object paradigm. But the C++ Object Model's static nature is
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inflexibile in certain problem domains. Graphical User Interface
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programming is a domain that requires both runtime efficiency and a
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high level of flexibility. Qt provides this, by combining the speed of
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C++ with the flexibility of the Qt Object Model.
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<p> Qt adds these features to C++:
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<p> <ul>
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<li> a very powerful mechanism for seamless object
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communication called <a href="signalsandslots.html">signals and
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slots</a>;
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<li> queryable and designable <a href="properties.html">object
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properties</a>;
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<li> powerful <a href="eventsandfilters.html">events and event filters</a>,
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<li> contextual <a href="i18n.html">string translation for internationalization</a>;
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<li> sophisticated interval driven <a href="timers.html">timers</a>
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that make it possible to elegantly integrate many tasks in an
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event-driven GUI;
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<li> hierarchical and queryable <a href="objecttrees.html">object
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trees</a> that organize object ownership in a natural way;
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<li> guarded pointers, <a href="qguardedptr.html">QGuardedPtr</a>, that are automatically
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set to 0 when the referenced object is destroyed, unlike normal C++
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pointers which become "dangling pointers" when their objects are destroyed.
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</ul>
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<p> Many of these Qt features are implemented with standard C++
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techniques, based on inheritance from <a href="qobject.html">QObject</a>. Others, like the
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object communication mechanism and the dynamic property system,
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require the <a href="metaobjects.html">Meta Object System</a> provided
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by Qt's own <a href="moc.html">Meta Object Compiler (moc)</a>.
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<p> The Meta Object System is a C++ extension that makes the language
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better suited to true component GUI programming. Although templates can
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be used to extend C++, the Meta Object System provides benefits using
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standard C++ that cannot be achieved with templates; see <a href="templates.html">Why doesn't Qt use templates for signals and
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slots?</a>.
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<p>
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<!-- eof -->
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<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>Qt 3.3.8</div>
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</table></div></address></body>
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