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Hello,
i have a question related to Realview Compiler V3.0. Is the forward declaration of a class not supported or is it a mistake of me? Please look the example below:
class clsB; // Forward Declaration Not Working class clsA { public: clsA(); // Constructor clsB oB; // Compiler error: #70: incomplete type is not allowed }; class clsB { public: clsB(); // Constructor };
Thank you Eugen
It is a mistake by you.
The forward declaration only informs that there is a class clasB - the compiler doesn't know it's size, so you can't have a member of type clasB.
You can have a member of reference to clasB or pointer to clasB, since they have fixed size.
thank you Per for your reply.
Eugen
The forward declaration worked fine. It is the use of the incomplete type that is not allowed.
class clsA { public: clsA(); // Constructor clsB oB; // Compiler error: #70: incomplete type is not allowed };
Is not allowed (because it needs to know the full type of claB)
class clsA { public: clsA(); // Constructor clsB *oB; // No Compiler error: };
Is allowed because it does not need to know the full type of claB at this point.