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// not1 example
#include <iostream> // std::cout
#include <functional> // std::not1
#include <algorithm> // std::count_if
struct IsOdd {
bool operator() (const int& x) const {return x%2==1;}
typedef int argument_type;
};
int main () {
int values[] = {1,2,3,4,5};
int cx = std::count_if (values, values+5, std::not1(IsOdd()));
std::cout << "There are " << cx << " elements with even values.\n";
return 0;
}
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