std::count_if is an STL algorithm for counting elements in a container matching a certain predicate. For counting without a predicate use std::count.

Example: CountNonZeroes


#include <algorithm>

#include <vector>



//From http://www.richelbilderbeek.nl/CppCountNonZeroes.htm

int CountNonZeroes(const std::vector<double>& v)

{

 return std::count_if(

    v.begin(),

    v.end(),

    std::bind2nd(std::not_equal_to<double>(),0.0));

}

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(C++) std::count_if

Example: CountNonZeroes