CODEWITHSUNDEEP
objective-cfunction
bertday
bertday

Reputation: 10971

Obj-C function declaration in header

I am trying to put a C-style function in the header of an Objective-C class. (My terminology might be wrong here -- I'm just used to writing Objective-C class methods rather than functions). It looks as follows:

// Sort function
NSInteger sort(NSString *aString, NSString *bString, void *context);

NSInteger sort(NSString *aString, NSString *bString, void *context) {
    return [aString compare:bString options:NSNumericSearch];
}

Unforuntately this results in:

Expected '=', ',', ';', 'asm' or 'attribute' before '{' token

Any ideas as to what I'm missing? Thank you.

Upvotes: 6

Views: 6880

Answers (3)

Redwood
Redwood

Reputation: 69302

The body of your function needs to be in the .m file instead of in the header.

As long as the declaration of your function (NSInteger sort(NSString *aString, NSString *bString, void *context);) remains in the header you'll still be able to access the sort function from anywhere you import the header.

Upvotes: 2

Jorge Ramos
Jorge Ramos

Reputation: 891

When declaring C-Styled methods you must forget about - or +. Just declare the method as an standard C one, before the @end statement:

void function_name(int, int);

Upvotes: 2

CodeSmile
CodeSmile

Reputation: 64477

My guess is that you put the function definition within the @interface of your class. Instead, make sure C style function declarations are outside of Objective-C @interface declarations:

// declare C functions here
NSInteger sort(NSString *aString, NSString *bString, void *context);

@interface MyClass : NSObject
{
  // class instance vars
}

// class properties & instance methods
@end

Upvotes: 11

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