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E2453: Size of the type 'identifier' is unknown or zero (C++)

This type was used in a context where its size was needed.

For example, a struct tag might only be declared (the struct not defined yet).

It's illegal then to have some references to such an item (like sizeof) or to dereference a pointer to this type.

Rearrange your declarations so that the size of this type is available.

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