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