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

Question

In C++ I need to iterate a certain number of times, but I don't need an iteration variable. For example:

for( int x=0; x<10; ++x ) {     /* code goes here, i do not reference "x" in this code */ } 

I realize I can do this by replacing "code goes here" with a lambda or a named function, but this question is specifically about for loops.

I was hoping that C++11's range-based for loops would help:

for( auto x : boost::irange(0,10) ) {     /* code goes here, i do not reference "x" in this code */ } 

but the above gives an "unreferenced local variable" since I never explicitly reference x.

I'm wondering if there is a more elegant way to write the above for loops so that the code does not generate an "unreferenced local variable" warning.

Answer 1

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