(C++) Answer of exercise #11: Obtaining a std::vector of read-only (smart?) pointers

This is the answer of Exercise #11: Obtaining a std::vector of read-only (smart?) pointers.


#include <vector>

#include <boost/checked_delete.hpp>

#include <boost/foreach.hpp>

#include <boost/shared_ptr.hpp>



struct MyStruct

{

  int m_x;



  private:

  ~MyStruct() {}

  friend void boost::checked_delete<>(MyStruct *);

};



struct MyStructKeeper

{

  std::vector<const MyStruct*> Get() const

  {

    std::vector<const MyStruct*> v;

    BOOST_FOREACH(const boost::shared_ptr<MyStruct>& s,m_v)

    {

      v.push_back(s.get());

    }

    return v;

  }

  private:

  std::vector<boost::shared_ptr<MyStruct> > m_v;

};



int main()

{

  //Second part

  MyStructKeeper k1;

  MyStructKeeper k2;

  std::vector<const MyStruct*> v1 = k1.Get();

  const std::vector<const MyStruct*> v2 = k2.Get();

  std::copy(v2.begin(),v2.end(),std::back_inserter(v1));

  //v1[0]->m_x = 0; //Should not compile

  //delete v1[0].get(); //Should not compile

}

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