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

 

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

 

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#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

 

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#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)); }