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70 lines
1.7 KiB
C++
70 lines
1.7 KiB
C++
/*++
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Copyright (c) 2006 Microsoft Corporation
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Module Name:
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spc_asserted_literals.h
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Abstract:
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<abstract>
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Author:
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Leonardo de Moura (leonardo) 2008-02-14.
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Revision History:
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--*/
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#ifndef _SPC_ASSERTED_LITERALS_H_
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#define _SPC_ASSERTED_LITERALS_H_
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#include"spc_clause.h"
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#include"substitution_tree.h"
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#include"obj_hashtable.h"
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namespace spc {
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/**
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\brief Index for the asserted literals in the logical context.
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This index is used to implement forward unit subsumption,
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equality subsumption, positive simplify-reflect, and
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negative simplify-reflect.
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*/
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class asserted_literals {
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protected:
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typedef obj_map<expr, clause*> expr2clause;
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ast_manager & m_manager;
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substitution_tree * m_st[2];
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expr2clause * m_expr2clause[2];
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substitution m_subst;
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tmp_app m_tmp_eq1;
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tmp_app m_tmp_eq2;
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public:
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asserted_literals(ast_manager & m);
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~asserted_literals();
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void insert(clause * cls);
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void erase(clause * cls);
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void reset();
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void reserve_vars(unsigned num_vars) { m_subst.reserve_vars(num_vars); }
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clause * gen(literal const & l) {
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return gen(l.atom(), l.sign());
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}
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clause * gen(expr * atom, bool neg);
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clause * gen_eq(expr * lhs, expr * rhs);
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clause * subsumes(expr * lhs, expr * rhs);
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bool has_pos_literals() const { return !m_st[0]->empty(); }
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bool has_neg_literals() const { return !m_st[1]->empty(); }
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bool has_literals() const { return has_pos_literals() || has_neg_literals(); }
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};
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};
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#endif /* _SPC_ASSERTED_LITERALS_H_ */
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