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Forward Declaration of a Typedef in C
In C , a forward declaration allows you to refer to a class or struct name before it's fully defined. This can be useful for situations like circular dependencies, where two header files need to include each other.
The question arises: can you also forward declare a typedef? The answer is yes, you can. However, there's a caveat. Unlike class or struct forward declarations, typedef forward declarations require the underlying type to be already forward declared.
To forward declare a typedef, follow these steps:
For example:
class A; typedef A B;
By following these steps, you can forward declare typedefs even though forward declarations normally apply to classes and structs. This can help minimize the inclusion tree and improve compilation speed.
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