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#ifndef NETGEN_CORE_XBOOL_HPP
#define NETGEN_CORE_XBOOL_HPP
/**************************************************************************/
/* File: xbool.hpp */
/* Author: Joachim Schoeberl */
/* Date: 14. Nov. 07 */
/**************************************************************************/
namespace ngcore
{
// an extended bool with values false/maybe/true
enum TMAYBE { maybe };
class xbool
{
uint8_t state;
public:
xbool (bool b) : state(b ? 2 : 0) { ; }
xbool (TMAYBE /* x */) : state(1) { ; }
xbool () = default;
xbool (const xbool &) = default;
xbool & operator= (bool b) { state = b ? 2 : 0; return *this; }
xbool & operator= (TMAYBE /* x */) { state = 1; return *this; }
bool IsTrue () const { return state == 2; }
bool IsMaybe () const { return state == 1; }
bool IsFalse () const { return state == 0; }
bool IsMaybeTrue() const { return state >= 1; }
bool IsMaybeFalse() const { return state <= 1; }
friend ostream & operator<< (ostream & ost, xbool xb);
};
static char output[] = "0?1";
inline ostream & operator<< (ostream & ost, xbool xb)
{
return ost << output[xb.state];
}
} // namespace ngcore
#endif // NETGEN_CORE_XBOOL_HPP
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