Difference between revisions of "Documentation/DevGuide/ProUNO/C++/Mapping of Singletons"
From Apache OpenOffice Wiki
< Documentation | DevGuide
OOoWikiBot (Talk | contribs) m (Robot: Changing Category:Documentation/Developers Guide/Professional UNO) |
m |
||
Line 7: | Line 7: | ||
|NextPage=Documentation/DevGuide/ProUNO/C++/Using Weak References | |NextPage=Documentation/DevGuide/ProUNO/C++/Using Weak References | ||
}} | }} | ||
+ | [[zh:Zh/Documentation/DevGuide/ProUNO/C++/Mapping of Singletons]] | ||
{{DISPLAYTITLE:Mapping of Singletons}} | {{DISPLAYTITLE:Mapping of Singletons}} | ||
A new-style singleton of the form | A new-style singleton of the form |
Revision as of 02:56, 7 July 2008
A new-style singleton of the form
singleton Name: XIfc;
is mapped to a C++ class with the same name. The class has a single member function
public: static com::sun::star::uno::Reference< XIfc > get( com::sun::star::uno::Reference< com::sun::star::uno::XComponentContext > const & context) throw (com::sun::star::uno::RuntimeException) { ... }
The semantics of such a singleton getter function in C++ are as follows (they are the same as for Java):
- The com.sun.star.uno.XComponentContext argument must be non-null.
- The singleton getter uses com.sun.star.uno.XComponentContext:getValueByName to obtain the singleton instance (within the "
/singletons/
" name space). - If no singleton instance could be obtained, the singleton getter fails by throwing a com.sun.star.uno.DeploymentException. The net effect is that a singleton getter either returns the requested non-null singleton instance, or throws an exception; a singleton getter will never return a null instance.
Old-style services are not mapped into the C++ language binding.
Content on this page is licensed under the Public Documentation License (PDL). |