This is the answer of Exercise #9: No for-loops.

Question: CountNonZeroPositives

Replace the for-loop. You will need:

std::bind2nd
std::count_if
std::greater


#include <vector>



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

{

  int sum = 0;

  const size_t sz = v.size();

  for (size_t i = 0; i!=sz; ++i)

  {

    if (v[i]>0) sum+=v[i];

  }

}

Answer


#include <algorithm

#include <functional>

#include <vector>



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

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

{

  return std::count_if(

    v.begin(),

    v.end(),

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

}

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(C++) Answer of exercise #9: No for-loops #20

Question: CountNonZeroPositives

Answer