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

February 24, 2017 · View on GitHub

 

 

 

 

 

(C++) C++98 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 }