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69 lines
1.5 KiB
C++
69 lines
1.5 KiB
C++
#pragma once
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//
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// FILE: Troolean.h
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.5
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// PURPOSE: Arduino Library for a three state logic datatype supporting {true false unknown}
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// URL: https://github.com/RobTillaart/Troolean
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// https://en.wikipedia.org/wiki/Three-valued_logic
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// Kleene and Priest logics
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#include "Arduino.h"
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#include "Printable.h"
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#define TROOLEAN_LIB_VERSION (F("0.1.5"))
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// 0 = false, -1 = unknown anything else = true
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#define unknown -1
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class Troolean: public Printable
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{
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public:
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Troolean();
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Troolean(const int8_t); // 0 = false, -1 = unknown anything else = true
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Troolean(const Troolean&);
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size_t printTo(Print&) const;
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bool operator == (const Troolean&);
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bool operator == (const bool&);
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bool operator == (const int&);
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bool operator != (const Troolean&);
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bool operator != (const bool&);
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bool operator != (const int&);
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operator bool() const;
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Troolean operator ! (); // negation
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Troolean operator && (const Troolean&);
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Troolean operator && (const bool&);
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Troolean operator || (const Troolean&);
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Troolean operator || (const bool&);
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// faster than ==
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inline bool isTrue() { return _value == 1; };
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inline bool isFalse() { return _value == 0; };
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inline bool isUnknown() { return _value == -1; };
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// ideas
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// Troolean operator &&=
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// Troolean operator ||=
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//
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// bool toBool(); // returns random true/false if unknown....
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// extend with dontcare ? ==> four state logic ? Foolean?
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private:
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int8_t _value;
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};
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// -- END OF FILE --
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