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

Question #17: Halve

Replace the for-loop. You will need:

std::bind2nd
std::divides
std::transform


#include <vector>

 

void Halve (std::vector<double>& v)

{

  const int sz = static_cast<int>(v.size());

  for (int i=0; i!=sz; ++i)

  {

    v[i]/=2.0;

  }

}

Answer


#include <algorithm>

#include <numeric>

#include <vector>

 

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

void Halve (std::vector<double>& v)

{

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

    std::bind2nd(std::divides<double>(),2.0));

}

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(C++) Answer of exercise #9: No for-loops #17

Question #17: Halve

Answer