Why we used double pointer in objective-C or C language?

Posted by Rajendra Bhole on Stack Overflow See other posts from Stack Overflow or by Rajendra Bhole
Published on 2010-04-03T06:23:23Z Indexed on 2010/04/03 6:33 UTC
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Hi, I confused when i want to take single pointer and when should i take double pointer? In following structure what exactly did?

struct objc_class {
    Class isa;
    Class super_class;
    const char *name;
    long version;
    long info;
    long instance_size;
    struct objc_ivar_list *ivars;
    struct objc_method_list **methodLists;
    struct objc_cache *cache;
    struct objc_protocol_list *protocols;
};

Why we use the "**methodLists" double pointer?

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