CODEWITHSUNDEEP
c++structheaderextern
user2610529
user2610529

Reputation: 491

Implementing structure from other header file

I have to have a structure "configset" in a class-header, something like this:

class A {
public:
    static configset *getnext();
}

Of course the compiler complains that configset isn't a type, but it is implemented in another header-file, along with some functions. Because of that I can't just include that header-file, the compiler would throw errors that these functions are defined multiple times. But how can I get the configset in my class-header? Just copying won't work also, since the compiler throws then an error that the structure was defined twice.

Upvotes: 0

Views: 82

Answers (3)

nullptr
nullptr

Reputation: 11058

Move the implementation of the configset methods into a separate .cpp (not header) file.

Upvotes: 1

Chris Cooper
Chris Cooper

Reputation: 432

Use a forward declaration like so:

// Forward declare configset. Tells compiler that the class/struct is defined in 
// another translation unit
struct configset;

class A {
public:
    static configset *getnext();
};

Note that this only works as long as you only use pointers to configset.

Upvotes: 1

David Brown
David Brown

Reputation: 13526

Forward declare configset or declare your functions that are defined in a header file as inline.

Upvotes: 1

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