std::count is an STL algorithm for counting elements in a container. For conditional counting use std::count_if.


#include <algorithm>

#include <cassert>

#include <vector>



int main()

{

  std::vector<int> v;

  v.push_back(1);

  v.push_back(2);

  v.push_back(2);

  v.push_back(3);

  v.push_back(3);

  v.push_back(3);



  assert(std::count(v.begin(),v.end(),1)==1);

  assert(std::count(v.begin(),v.end(),2)==2);

  assert(std::count(v.begin(),v.end(),3)==3);

}

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(C++) std::count