Code snippet to count the number of non-zero positive values in a std::vector.


#include <algorithm

#include <functional>

#include <vector>



//From http://www.richelbilderbeek.nl/CppCountNonZeroPositives

int CountNonZeroPositives(const std::vector<int>& v)

{

 return std::count_if(

    v.begin(),

    v.end(),

    std::bind2nd(std::greater<int>(),0));

}

CountNonZeroPositives test


#include <cassert>



int main()

{

  std::vector<int> v;

  v.push_back(-3); assert(CountNonZeroPositives(v)==0);

  v.push_back(-2); assert(CountNonZeroPositives(v)==0);

  v.push_back(-1); assert(CountNonZeroPositives(v)==0);

  v.push_back( 0); assert(CountNonZeroPositives(v)==0);

  v.push_back( 1); assert(CountNonZeroPositives(v)==1);

  v.push_back( 2); assert(CountNonZeroPositives(v)==2);

  v.push_back( 3); assert(CountNonZeroPositives(v)==3);

  v.push_back( 4); assert(CountNonZeroPositives(v)==4);

}

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(C++) CountNonZeroPositives

CountNonZeroPositives test