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Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
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Leonardo de Moura 2012-10-02 11:35:25 -07:00
parent 3f9edad676
commit e9eab22e5c
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lib/sat_justification.h Normal file
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/*++
Copyright (c) 2011 Microsoft Corporation
Module Name:
sat_justification.h
Abstract:
Justifications for SAT assignments
Author:
Leonardo de Moura (leonardo) 2011-05-21.
Revision History:
--*/
#ifndef _SAT_JUSTIFICATIONS_H_
#define _SAT_JUSTIFICATIONS_H_
namespace sat {
class justification {
public:
enum kind { NONE, BINARY, TERNARY, CLAUSE, EXT_JUSTIFICATION };
private:
unsigned m_val1;
unsigned m_val2;
justification(ext_justification_idx idx, kind k):m_val1(idx), m_val2(k) {}
public:
justification():m_val1(0), m_val2(NONE) {}
justification(literal l):m_val1(l.to_uint()), m_val2(BINARY) {}
justification(literal l1, literal l2):m_val1(l1.to_uint()), m_val2(TERNARY + (l2.to_uint() << 3)) {}
justification(clause_offset cls_off):m_val1(cls_off), m_val2(CLAUSE) {}
justification mk_ext_justification(ext_justification_idx idx) { return justification(idx, EXT_JUSTIFICATION); }
kind get_kind() const { return static_cast<kind>(m_val2 & 7); }
bool is_none() const { return m_val2 == NONE; }
bool is_binary_clause() const { return m_val2 == BINARY; }
literal get_literal() const { SASSERT(is_binary_clause()); return to_literal(m_val1); }
bool is_ternary_clause() const { return get_kind() == TERNARY; }
literal get_literal1() const { SASSERT(is_ternary_clause()); return to_literal(m_val1); }
literal get_literal2() const { SASSERT(is_ternary_clause()); return to_literal(m_val2 >> 3); }
bool is_clause() const { return m_val2 == CLAUSE; }
clause_offset get_clause_offset() const { return m_val1; }
bool is_ext_justification() const { return m_val2 == EXT_JUSTIFICATION; }
ext_justification_idx get_ext_justification_idx() const { return m_val1; }
};
};
#endif