trilean.h

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#if !defined(VITA_TRILEAN_H)
#define      VITA_TRILEAN_H
 
#include <iostream>
 
#include "kernel/common.h"
 
namespace vita
{
 
enum class trilean {unknown = -1, no, yes};
 
inline std::istream &operator>>(std::iostream &i, trilean &v)
{
  int tmp;
 
  if (i >> tmp)
    switch (tmp)
    {
    case 0:  v =      trilean::no; break;
    case 1:  v =     trilean::yes; break;
    default: v = trilean::unknown;
    }
 
  return i;
}
 
inline trilean &assign(trilean &lhs, bool rhs)
{
  return lhs = rhs ? trilean::yes : trilean::no;
}
 
}  // namespace vita
 
#endif  // include guard