This allows you to use a pointer to the type without having to include the relevant header file in your header file (instead you only need it in the. Use the methods of the class in a method. Pointer), or if you need to use it as a base class, or if you need to If you have a member whose type is that class directly (not a Not sufficient if you need to use the actual class type, for example, reducing the volume of the pre-processed files.reduce the number of files opened by #include (hence the number of.Reducing compilation time by reducing the number of header inclusion. if a class contains a member that is a pointer (or aįorward-declaration is used to avoid unnecessary coupling which help This is especially useful inside classĭefinitions, e.g. Type (since all object pointers are the same size, and this is what In C++, classes and structs can be forward-declared like this: class M圜lass įorward-declared if you only need to use the pointer-to-that-class Situations when it is necessary to know that the name of the class isĪ type, but where it is unnecessary to know the structure. Sometimes necessary to forward-declare classes. In some object-oriented languages like C++ and Objective-C, it is
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