C++11 range-based for loops without loop variable

Edit now with 100% fewer loop variables declared.

template <typename F>
void repeat(unsigned n, F f) {
    while (n--) f();
}

Use it as:

repeat(10, f);

or

repeat(10, [] { f(); });

or

int g(int);
repeat(10, std::bind(g, 42));

See it live at http://ideone.com/4k83TJ