Predicate to perform operator!= on two values.
The code below shows how to count the number of non-zero values.
#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)); }