...之C++运行时类型转换(Runtime Cast) 通过pointer或reference来决定对象运行时类型的一种方法是使用运行时类型转换(runtime cast),用这种方法可以查证所尝试进行的转换正确与否.当要把基类pointer转换为派生类型时,这种方法非常有用.
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这些警告的原因是将在运行时中执行类型转换。
The reason for these warnings is that a type conversion will be executed in runtime.
CriteriaQuery被传递给一个可执行查询并保留类型信息，这样可以直接访问选择列表的元素，而不需要任何运行时强制类型转换。
CriteriaQuery is transferred to an executable query with its type information preserved so that the elements of the selected list can be accessed without any run-time casting.
在运行时获取图属性，需要强制图对象转换到特定类型，如下例所示。
At runtime, to access a diagram's properties, it's required to cast your instance of a diagram object to a specific type, as the following example demonstrates.
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