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#include <iostream>
#include <vector>
using namespace std;
class B{};
class C : public B{};
template <class T>
class A {
    public:
        A(T * p) : ptr(p) {}
        A & operator = ( A && p){
            swap (p.ptr, ptr );
            return *this;
        }
        void pr(){cout<<*ptr<<endl;}
    private:
        T * ptr;
        int ai;
};
int main(){
    int a=5;
    int *p1=&a;
    //A <B> pa2(new C);
    A <int *> pa1 (new int *(p1 ));
    // pa1.pr();
    A<int> aob1(p1);
    aob1.pr();
    int b=6;
    int *p2=&b;
    A<int> aob2(p2);
    aob2.pr();
    aob2=aob1;
    aob2.pr();
}

prog.cpp: In function ‘int main()’:
prog.cpp:31:10: error: use of deleted function ‘constexpr A<int>& A<int>::operator=(const A<int>&)’
     aob2=aob1;
          ^~~~
prog.cpp:7:7: note: ‘constexpr A<int>& A<int>::operator=(const A<int>&)’ is implicitly declared as deleted because ‘A<int>’ declares a move constructor or move assignment operator
 class A {
       ^

Standard output is empty