C++ std::count function
// count algorithm example
#include <iostream> // std::cout
#include <algorithm> // std::count
#include <vector> // std::vector
int main () {
// counting elements in array:
int myints[] = {10,20,30,30,20,10,10,20}; // 8 elements
int mycount = std::count (myints, myints+8, 10);
std::cout << "10 appears " << mycount << " times.\n";
// counting elements in container:
std::vector<int> myvector (myints, myints+8);
mycount = std::count (myvector.begin(), myvector.end(), 20);
std::cout << "20 appears " << mycount << " times.\n";
return 0;
}