Forward-declare enum in Objective-C

Question

I\'m having trouble with enum visibility in an Objective-C program. I have two header files, and one defines a typedef enum. Another file needs to use the

Answer 1

If you are ok using compiler extensions, you could use this order in Clang:

enum Enum;
typedef enum Enum Enum2;

void f(Enum2); // ok. it sees this type's true name.

enum Enum {
    E_1
};

// ok. now its declaration is visible and we can use it.

void f(Enum2 e) {

}

Note: It will trigger a -Wpedantic warning.

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If you are using C++11, you should use their enums, which are safe to forward declare -- e.g. enum class Enum:uint8_t; (not a compiler extension).