C++ transform vector of pointers -

hey trying transform vectors of pointers object vector of pointers different object.

i have been given following classes:

class test; class test2 {     public:         test2(test*); } 

i unfamiliar on how create functor. part of sample exam exams later week confused on question though. following link explains use of transform quite problem little different. great!

reference: http://www.cplusplus.com/reference/algorithm/transform/

a functor 1 overloads operator(). can define functor as:

struct test2generator {      //this called std::transform      test2* operator()(test1 *param) const      {           return new test2(param);      } }; 

then use as:

std::vector<test1*> v1; //fill v1  std::vector<test2*> v2(v1.size());  std::transform(v1.begin(), v1.end(), v2.begin(), test2generator()); 

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in c++11, don't need define functor, instead can use lambda as:

std::transform(v1.begin(),                 v1.end(),                 v2.begin(),                 [](test1 *param) { return new test2(param); });