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James Sioutis

problem declaring classes

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If you have 2 classes such as... class ClassOne { public: ClassTwo something; }; class ClassTwo { public: ClassOne somethingElse; }; How in the hell would you be able to do this? Is there a way you can pre-define classes at the beginning of the file so they will be accessible without the compiler saying there's errors?

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You can't do that. That would require ClassOne to contain a ClassTwo, which contains a ClassOne, which contains a ClassTwo.... That would require each of the classes to be infinitely large.

What you can do is have ClassOne contain a pointer or reference to a ClassTwo and a ClassTwo contain a pointer or reference to ClassOne. You do this with a forward declaration. Ex:

class ClassTwo;

class ClassOne {
ClassTwo * something;
};

class ClassTwo {
ClassOne * something_else;
};


For more information see this article.

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