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

Question #10: Widget::DoIt on boost::shared_ptr<Widget>

Replace the for-loop. You will need:

std::for_each
boost::mem_fn


#include <vector>

#include <boost/shared_ptr.hpp>

 

struct Widget

{

  void DoIt() const { /* do it */ }

};

 

void DoIt(const std::vector<boost::shared_ptr<Widget> >& v)

{

  const std::size_t sz = v.size();

  for (std::size_t i=0; i!=sz; ++i)

  {

    v[i]->DoIt();

  }

}

Answer


#include <algorithm>

#include <numeric>

#include <vector>

#include <boost/shared_ptr.hpp>



struct Widget

{

  void DoIt() const { /* do it */ }

};



void DoIt(const std::vector<boost::shared_ptr<Widget> >& v)

{

  std::for_each(v.begin(),v.end(),boost::mem_fn(&Widget::DoIt));

}

Go back to Richel Bilderbeek's C++ page.

Go back to Richel Bilderbeek's homepage.

(C++) Answer of exercise #9: No for-loops #10

Question #10: Widget::DoIt on boost::shared_ptr<Widget>

Answer