38 lines
904 B
C++
38 lines
904 B
C++
/*
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Copyright (c) 2013 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Author: Leonardo de Moura
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*/
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#pragma once
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#include <memory>
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#include "kernel/expr.h"
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namespace lean {
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/**
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\brief Functional object for creating expressions with maximally
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shared sub-expressions.
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*/
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class max_sharing_fn {
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struct imp;
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friend expr max_sharing(expr const & a);
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std::unique_ptr<imp> m_ptr;
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public:
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max_sharing_fn();
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~max_sharing_fn();
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expr operator()(expr const & a);
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/** \brief Return true iff \c a was already processed by this object. */
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bool already_processed(expr const & a) const;
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/** \brief Clear the cache. */
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void clear();
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};
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/**
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\brief The resultant expression is structurally identical to the input one, but
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it uses maximally shared sub-expressions.
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*/
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expr max_sharing(expr const & a);
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}
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