incomplete type is not allowed

incomplete type is not allowed

1. c++ “Incomplete type not allowed” error accessing class reference information (Circular dependency with forward declaration)
2. Friendship and inheritance
3. error: incomplete type is not allowed
4. Incomplete class declarations (C++ only)
5. Thread: Incomplete type is not allowed
6. What's the solution for 'Incomplete type not allowed' ? / structure, c language

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