| http://www.w3.org/ns/prov#value | - If you declare a class T, you can use it in limited ways even before it is defined. (That is, before its definition is finished: a class is incomplete within its definition.) You can work with pointers and references of type T* and T&; you can write functions that have such pointers and references as part of their signature; you can even declare an extern object of type T. Some of what you can not d
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