(C++) Answer of exercise #9: No for-loops #14

 

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

 

 

 

 

 

Question #14: Make square

 

Replace the for-loop. You will need:

• std::transform
• your own std::unary_function

 

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#include <vector> void MakeSquare(std::vector<int>& v) {   const int sz = v.size();   for (int i=0; i!=sz; ++i)   {     v[i]*=v[i];   } }

 

 

 

 

 

Answer

 

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#include <algorithm> #include <functional> #include <vector> template <class T> struct Square : public std::unary_function<T,T> {   const T operator()(const T& x) const { return x*x; } }; void MakeSquare(std::vector<int>& v) {   std::transform(v.begin(),v.end(),v.begin(),Square<int>()); }