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// This file is part of VIBes' C++ API examples non-guaranteed interval library
//
// Copyright (c) 2013 Luc Jaulin
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#ifndef __IBOOLEAN__
#define __IBOOLEAN__
#include <iosfwd>
class QDebug;
// IBOOLEAN is an interval Boolean. Used for a trivalued logic
// if x=[0,0]=ifalse : certainly false
// if x=[0,1]=iperhaps: don't know
// if x=[1,1]=itrue : certainly true
// Otherwise x=empty
enum IBOOLEAN {itrue, ifalse, iperhaps, empty};
class iboolean
{
public:
IBOOLEAN value;
public:
iboolean ();
iboolean (bool);
iboolean (IBOOLEAN);
iboolean (const iboolean&);
};
iboolean operator&& (iboolean, iboolean);
iboolean operator|| (iboolean, iboolean);
iboolean operator! (iboolean);
bool operator== (iboolean, iboolean);
bool operator!= (iboolean, iboolean);
std::ostream& operator<< (std::ostream& os, const iboolean&);
QDebug operator<< (QDebug, const iboolean&);
iboolean Inter(iboolean,iboolean);
iboolean Not(iboolean x);
iboolean Union(iboolean, iboolean);
iboolean And(iboolean,iboolean);
iboolean Or(iboolean,iboolean);
iboolean leq(iboolean x, iboolean y);
iboolean geq(iboolean x, iboolean y);
iboolean Restrict(iboolean x, iboolean y); // return x and !y
iboolean Xor(iboolean x, iboolean y);
#endif
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