Suma binaria ....

//compilacion g++ -std=c++11 -o NombreEjecutable NombreFuente.cpp
//SUMA BINARIA bit a bit utilizando carry
#include <iostream>
using namespace std;
#define uno 0xFF
#define X(i) (x & bit)
#define Y(i) (y & bit)
#define Cy(i) (carry & bit)

int suma (unsigned char x,unsigned char y,unsigned char carry=0,size_t max_bits=128){
    unsigned char d(0);
    for (size_t bit=1;bit<=max_bits; bit=bit<<1){//Desplaza un bit hacia izq.
        //suma bit a bit teniendo en cuenta el carry
        d |= X(i) ^ Y(i)  ^ Cy(i)  ;

        //en una suma binaria 1 + 1 =0 y me llevo 1 carry,carry uno
        ((!(X(i) ^ Y(i)  ^ Cy(i)) && ( X(y) | Y(y) | Cy(i) )) || X(y) & Y(i) & Cy(i)) ? carry=uno : carry=0;

        cout <<"bit="<<bit<<'\t' << ", x= "<< (X(i) ? " 1 ": " 0 ") << " , y= " << (Y(i) ? " 1 ": " 0 ")<< " , cy= "<< (Cy(i) ? " 1 ": " 0 ")<<endl;

    }
    return d;
}
int main (){

    cout <<suma (8,8) << endl;//16
    cout <<suma (8,7) << endl;//15
    cout <<suma (9,7) << endl;//16
    cout <<suma (10,7) << endl;//17
    cout <<suma (11,7) << endl;//18
    cout <<suma (25,25) << endl;//50
    cout <<suma (127,127) << endl;//254

    return 0;
}