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

Question

Replace the for-loop. You will need the following:

std::for_each
std::bind2nd
std::multiplies


#include <vector>



void Triple(std::vector<int>& v)

{

  const int sz = v.size();

  for (int i=0; i!=sz; ++i)

  {

    v[i]*=3;

  }

}

Answer


#include <vector>

#include <algorithm

#include <numeric>

 

void Triple(std::vector<int>& v)

{

  std::transform(v.begin(),v.end(),v.begin(),

    std::bind2nd(std::multiplies<int>(),3));

}

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(C++) Answer of exercise #9: No for-loops #0

Question

Answer