61 lines
2.6 KiB
C++
61 lines
2.6 KiB
C++
/**************************************************************************************************
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MiniSat -- Copyright (c) 2003-2005, Niklas Een, Niklas Sorensson
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Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
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associated documentation files (the "Software"), to deal in the Software without restriction,
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including without limitation the rights to use, copy, modify, merge, publish, distribute,
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sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all copies or
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substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
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NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT
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OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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**************************************************************************************************/
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#ifndef SolverTypes_h
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#define SolverTypes_h
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#ifndef Global_h
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#include "Global.h"
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#endif
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//=================================================================================================
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// Variables, literals:
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// NOTE! Variables are just integers. No abstraction here. They should be chosen from 0..N,
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// so that they can be used as array indices.
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typedef int Var;
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#define var_Undef (-1)
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class Lit {
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int x;
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public:
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Lit(void) /* unspecifed value allowed for efficiency */ { }
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explicit Lit(Var var, bool sign = false) : x((var+var) + sign) { }
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friend Lit operator ~ (Lit p) { Lit q; q.x = p.x ^ 1; return q; }
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friend bool sign (Lit p) { return p.x & 1; }
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friend int var (Lit p) { return p.x >> 1; }
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friend int index(Lit p) { return p.x; } // A "toInt" method that guarantees small, positive integers suitable for array indexing.
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friend Lit toLit(int i) { Lit p; p.x = i; return p; }
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friend bool operator == (Lit p, Lit q) { return index(p) == index(q); }
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friend bool operator < (Lit p, Lit q) { return index(p) < index(q); } // '<' guarantees that p, ~p are adjacent in the ordering.
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};
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const Lit lit_Undef(var_Undef, false); // }- Useful special constants.
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const Lit lit_Error(var_Undef, true ); // }
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//=================================================================================================
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#endif
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