In file included from main.cpp:1:
./shared_ptr.h:13:18: warning: in-class initialization of non-static data member
      is a C++11 extension [-Wc++11-extensions]
        int count=0;
                 ^
./shared_ptr.h:30:19: warning: instantiation of variable
      'shared_ptr<int>::setOfPointers' required here, but no definition is
      available [-Wundefined-var-template]
    for(int i=0;i<setOfPointers.size();i++){
                  ^
main.cpp:4:21: note: in instantiation of member function
      'shared_ptr<int>::shared_ptr' requested here
    shared_ptr<int> shp(new int(10));
                    ^
./shared_ptr.h:16:38: note: forward declaration of template entity is here
    static std::vector< storage<T> > setOfPointers;
                                     ^
2 warnings generated.
Undefined symbols for architecture x86_64:
  "shared_ptr<int>::setOfPointers", referenced from:
      shared_ptr<int>::shared_ptr(int*) in main-c9b010.o
      shared_ptr<int>::~shared_ptr() in main-c9b010.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)