Difference between revisions of "Documentation/DevGuide/WritingUNO/XWeak"
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A component supporting <code>XWeak</code> offers other objects to hold a reference on itself without preventing it from being destroyed when it is no longer needed. Thus, cyclic references can be avoided easily. The chapter [[Documentation/DevGuide/ProUNO/Lifetime of UNO objects|Lifetime of UNO Objects]] discusses this in detail. In Java, derive from the Java helper <code>class com.sun.star.lib.uno.helper.WeakBase</code> to support <code>XWeak</code>. If a C++ component is derived from one of the <code>::cppu::Weak...ImplHelperNN</code> template classes as proposed in the section [[Documentation/DevGuide/WritingUNO/C++/C++ Component|C++ Component]], a <code>XWeak</code> support is obtained, virtually for free. For the sake of completeness, this is the <code>XWeak</code> specification: | A component supporting <code>XWeak</code> offers other objects to hold a reference on itself without preventing it from being destroyed when it is no longer needed. Thus, cyclic references can be avoided easily. The chapter [[Documentation/DevGuide/ProUNO/Lifetime of UNO objects|Lifetime of UNO Objects]] discusses this in detail. In Java, derive from the Java helper <code>class com.sun.star.lib.uno.helper.WeakBase</code> to support <code>XWeak</code>. If a C++ component is derived from one of the <code>::cppu::Weak...ImplHelperNN</code> template classes as proposed in the section [[Documentation/DevGuide/WritingUNO/C++/C++ Component|C++ Component]], a <code>XWeak</code> support is obtained, virtually for free. For the sake of completeness, this is the <code>XWeak</code> specification: | ||
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// module com::sun::star::uno::XWeak | // module com::sun::star::uno::XWeak | ||
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com::sun::star::uno::XAdapter queryAdapter(); | com::sun::star::uno::XAdapter queryAdapter(); | ||
}; | }; | ||
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{{PDL1}} | {{PDL1}} | ||
[[Category:Documentation/Developer's Guide/Writing UNO Components]] | [[Category:Documentation/Developer's Guide/Writing UNO Components]] | ||
Latest revision as of 17:20, 23 December 2020
A component supporting XWeak offers other objects to hold a reference on itself without preventing it from being destroyed when it is no longer needed. Thus, cyclic references can be avoided easily. The chapter Lifetime of UNO Objects discusses this in detail. In Java, derive from the Java helper class com.sun.star.lib.uno.helper.WeakBase to support XWeak. If a C++ component is derived from one of the ::cppu::Weak...ImplHelperNN template classes as proposed in the section C++ Component, a XWeak support is obtained, virtually for free. For the sake of completeness, this is the XWeak specification:
// module com::sun::star::uno::XWeak interface XWeak: com::sun::star::uno::XInterface { com::sun::star::uno::XAdapter queryAdapter(); };
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