Delegate in C++11

Question

Does C++11 provide delegates?

If not, what is the best (most efficient) way to do something similar in C++? Boost.Signals? FastDelegate? Something else?

Answer 1

The C mechanism has always been function pointer & baton (except for qsort() and bsearch() which didn't take a baton).

So one would always pass the class object as the baton.

E.G.:

class tp {
    public:
        tp() { n = 0; }
        void m(int z) { printf("%d is %d\n", n++, z++); }
        int n;
};

void higher_func(int *opx, int cnt, void *handler(int itm, void *baton), void *baton)
{
    for (int i = 0; i < cnt; i++)
        handler(opx[itm], baton);
}

/* You would need to provide this stub -- potentially templateable */
void translate_baton(int itm, void *baton) { ((tp *)baton)->m(itm); }

/* used like so: */
int main()
{
    int array[7];

    //...
    tp cx;
    higher_func(array, 7, translate_baton, &cx);
}