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    template <class T> int bit_sizeof(T unused) {
            long long a,b,c;
            T x;
            x^=x;
            x|=1;
            a=b=c=x;
            b<<=8;
            c<<=3;
            x=b;
            while (x) {
                    a<<=1;
                    b<<=c;
                    c<<=1;
                    x=b;
            }
            return a;
    }
 
 
int main() {
  int* pInt;
  auto i = bit_sizeof(pInt);
}

prog.cpp: In function ‘int main()’:
prog.cpp:24:8: warning: unused variable ‘i’ [-Wunused-variable]
   auto i = bit_sizeof(pInt);
        ^
prog.cpp: In instantiation of ‘int bit_sizeof(T) [with T = int*]’:
prog.cpp:24:27:   required from here
prog.cpp:6:14: error: invalid operands of types ‘int*’ and ‘int*’ to binary ‘operator^’
             x^=x;
              ^
prog.cpp:6:14: error:   in evaluation of ‘operator^=(int*, int*)’
prog.cpp:7:14: error: invalid operands of types ‘int*’ and ‘int’ to binary ‘operator|’
             x|=1;
              ^
prog.cpp:7:14: error:   in evaluation of ‘operator|=(int*, int)’
prog.cpp:8:18: error: invalid conversion from ‘int*’ to ‘long long int’ [-fpermissive]
             a=b=c=x;
                  ^
prog.cpp:11:14: error: invalid conversion from ‘long long int’ to ‘int*’ [-fpermissive]
             x=b;
              ^
prog.cpp:16:22: error: invalid conversion from ‘long long int’ to ‘int*’ [-fpermissive]
                     x=b;
                      ^

Standard output is empty