CODEWITHSUNDEEP
objective-ccstatic
Jakob
Jakob

Reputation: 982

using static c variables in Objective C classes

i have helper C functions in some Objective C classes. Just found out that the values of global, static C variables which i use in these functions are shared between instances of the class (duh), which is not what i want.

Is there a way to declare these variables local to instances of the class, so that they are visible by the helper functions without passing them explicitly?

Upvotes: 1

Views: 271

Answers (2)

justin
justin

Reputation: 104698

want to avoid method calls where necessary

logically separate it so your low level code is in c or c++, then add the required data to your objc class:

/* c example */

typedef struct t_generator {
    UInt32 a;
} t_generator;


static void Generate(t_generator* const gen) {
    /.../   
}

@interface MONObjCGeneratorContainer : NSObject
{
    t_generator generator;
    NSString * name;
    UInt32 b;
}
@end

if the data interface is as simple you can just access them from the instance:

- (void)method { GenerateB(&b); }

that should meet all the requirements you have posted (so far).

Upvotes: 2

mipadi
mipadi

Reputation: 410662

Is there a way to declare these variables local to instances of the class

Sure, make them instance variables.

But:

so that they are visible by the helper functions without passing them explicitly?

You can pass the object into the function. If you have appropriate accessors, the function can get them. And if you have mutators, it can modify them, too.

But if you're doing that, you might as well just create a method, and automatically have access to the instance variables.

Upvotes: 2

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