Difference between revisions of "Zh/Documentation/DevGuide/ProUNO/C++/Mapping of Singletons"
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Latest revision as of 02:50, 14 May 2009
以下形式的新式 singleton
singleton Name: XIfc;
被映射成同名的 C++ 类。该类具有单一成员函数
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) { ... }
在 C++ 中，这种 singleton getter 函数的语义如下（与 Java 中的语义相同）：
- com.sun.star.uno.XComponentContext:getValueByName 在
“/singletons/”名称空间内获取 singleton 实例。
- 如果未获取 singleton 实例，则 singleton getter 会抛出 com.sun.star.uno.DeploymentException 并以失败告终。实际结果是 singleton getter 或者返回所请求服务的 singleton 非空实例，或者抛出异常；singleton getter 决不会返回空实例。
没有将旧式服务映射至 C++ 语言绑定。
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