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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
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lib/nlsat_clause.h Normal file
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/*++
Copyright (c) 2012 Microsoft Corporation
Module Name:
nlsat_clause.h
Abstract:
Clauses used in the Nonlinear arithmetic satisfiability procedure.
Author:
Leonardo de Moura (leonardo) 2012-01-02.
Revision History:
--*/
#ifndef _NLSAT_CLAUSE_H_
#define _NLSAT_CLAUSE_H_
#include"nlsat_types.h"
#include"vector.h"
namespace nlsat {
class clause {
friend class solver;
unsigned m_id;
unsigned m_size;
unsigned m_capacity:31;
unsigned m_learned:1;
unsigned m_activity;
assumption_set m_assumptions;
literal m_lits[0];
static size_t get_obj_size(unsigned num_lits) { return sizeof(clause) + num_lits * sizeof(literal); }
size_t get_size() const { return get_obj_size(m_capacity); }
clause(unsigned id, unsigned sz, literal const * lits, bool learned, assumption_set as);
public:
unsigned size() const { return m_size; }
unsigned id() const { return m_id; }
literal & operator[](unsigned idx) { SASSERT(idx < m_size); return m_lits[idx]; }
literal const & operator[](unsigned idx) const { SASSERT(idx < m_size); return m_lits[idx]; }
bool is_learned() const { return m_learned; }
literal * begin() { return m_lits; }
literal * end() { return m_lits + m_size; }
literal const * c_ptr() const { return m_lits; }
void inc_activity() { m_activity++; }
void set_activity(unsigned v) { m_activity = v; }
unsigned get_activity() const { return m_activity; }
bool contains(literal l) const;
bool contains(bool_var v) const;
void shrink(unsigned num_lits) { SASSERT(num_lits <= m_size); if (num_lits < m_size) { m_size = num_lits; } }
assumption_set assumptions() const { return m_assumptions; }
};
typedef ptr_vector<clause> clause_vector;
};
#endif