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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;
  unsigned i = bit_sizeof(pInt);
}

prog.cpp: In function 'int bit_sizeof(T) [with T = int*]':
prog.cpp:24:   instantiated from here
prog.cpp:6: error: invalid operands of types 'int*' and 'int*' to binary 'operator^'
prog.cpp:6: error:   in evaluation of 'operator^=(int*, int*)'
prog.cpp:7: error: invalid operands of types 'int*' and 'int' to binary 'operator|'
prog.cpp:7: error:   in evaluation of 'operator|=(int*, int)'
prog.cpp:8: error: invalid conversion from 'int*' to 'long long int'
prog.cpp:11: error: invalid conversion from 'long long int' to 'int*'
prog.cpp:16: error: invalid conversion from 'long long int' to 'int*'

Standard output is empty