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68 lines
1.7 KiB
C++
68 lines
1.7 KiB
C++
/*++
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Copyright (c) 2007 Microsoft Corporation
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Module Name:
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pull_quant.h
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Abstract:
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Pull nested quantifiers.
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Author:
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Leonardo (leonardo) 2008-01-20
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Notes:
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--*/
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#ifndef _PULL_QUANT_H_
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#define _PULL_QUANT_H_
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#include"simplifier.h"
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#include"var_subst.h"
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/**
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\brief Pull nested quantifiers in a formula.
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\warning It assumes the input formula is in NNF.
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\remark pull_quant(F) is a quantifier if F contains a quantifier.
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\remark If pull_quant(F) is a quantifier then its weight is
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Min{weight(Q') | Q' is a quantifier nested in F}
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*/
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class pull_quant : public base_simplifier {
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protected:
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shift_vars m_shift;
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bool visit_children(expr * n);
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void reduce1(expr *);
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void reduce1_app(app * n);
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void reduce1_quantifier(quantifier * q);
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public:
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pull_quant(ast_manager & m);
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virtual ~pull_quant() {}
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void operator()(expr * n, expr_ref & r, proof_ref & p);
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void reset() { flush_cache(); }
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void pull_quant1(func_decl * d, unsigned num_children, expr * const * children, expr_ref & result);
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void pull_quant1(quantifier * q, expr * new_expr, expr_ref & result);
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void pull_quant1(expr * n, expr_ref & result);
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void pull_quant2(expr * n, expr_ref & r, proof_ref & pr);
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};
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/**
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\brief After applying this transformation the formula will not
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contain nested quantifiers.
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*/
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class pull_nested_quant : public simplifier {
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pull_quant m_pull;
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virtual bool visit_quantifier(quantifier * q);
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virtual void reduce1_quantifier(quantifier * q);
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public:
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pull_nested_quant(ast_manager & m):simplifier(m), m_pull(m) { enable_ac_support(false); }
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virtual ~pull_nested_quant() {}
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};
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#endif /* _PULL_QUANT_H_ */
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