swappable.h

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#ifndef SWAPPABLE_H__
#define SWAPPABLE_H__
#include "bit.h"
class Bit;

template<typename T>
class Swappable { public:
    T If(const Bit & sel, const T& rhs) const {
        return static_cast<const T*>(this)->select(sel, rhs);
    }
};
template<typename T>
inline T If(const Bit & select, const T & o1, const T & o2) {
    T res = o2;
    return res.If(select, o1);
}
template<typename T>
inline void swap(const Bit & swap, T & o1, T & o2) {
    T o = If(swap, o1, o2);
    o = o ^ o2;
    o1 = o ^ o1;
    o2 = o ^ o2;
}

#endif