void (C++)
2010-12-15 23:59 Rollen Holt 阅读(325) 评论(0) 编辑 收藏 举报When used as a function return type, the void keyword specifies that the function does not return a value. When used for a function's parameter list, void specifies that the function takes no parameters. When used in the declaration of a pointer, void specifies that the pointer is "universal."
If a pointer's type is void *, the pointer can point to any variable that is not declared with the const or volatile keyword. A void pointer cannot be dereferenced unless it is cast to another type. A void pointer can be converted into any other type of data pointer.
A void pointer can point to a function, but not to a class member in C++.
You cannot declare a variable of type void.
// void.cpp void vobject; // C2182 void *pv; // okay int *pint; int i; int main() { pv = &i; // Cast optional in C required in C++ pint = (int *)pv; }
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