#include <iostream>
 #include <memory>

 using std::cout;
 using std::endl;
 using std::shared_ptr;

 struct MyInt{
   MyInt(int v):val(v){
     cout << "  Hello: " << val << endl;
   }
   ~MyInt(){
     cout << "  Good Bye: " << val << endl;
   }
   int val;
 };

 template <typename T>
 struct Deleter{
   void operator()(T *ptr){
     ++Deleter::count;
     delete ptr;
   }
   static int count;
 };

 template <typename T>
 int Deleter<T>::count=0;

 typedef Deleter<int> IntDeleter;
 typedef Deleter<double> DoubleDeleter;
 typedef Deleter<MyInt> MyIntDeleter;

 int main(){
   cout << endl;
   {
     shared_ptr<int> sharedPtr1(new int(1998),IntDeleter());
     shared_ptr<int> sharedPtr2(new int(2011),IntDeleter());
     shared_ptr<double> sharedPtr3(new double(3.17),DoubleDeleter());
     shared_ptr<MyInt> sharedPtr4(new MyInt(2017),MyIntDeleter());
   }

   cout << "Deleted " << IntDeleter().count << " int values." << endl;
   cout << "Deleted " << DoubleDeleter().count << " double value." << endl;
   cout << "Deleted " << MyIntDeleter().count << " MyInt value." << endl;

   cout << endl;
 }