31 lines
795 B
C++
31 lines
795 B
C++
/*
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Copyright (c) 2015 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 <vector>
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#include "kernel/expr.h"
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namespace lean {
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/** \brief Cache for storing mappings from expressions to expressions.
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\warning The insert(k, v) method overwrites andy entry (k1, v1) when
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hash(k) == hash(k1)
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*/
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class expr_cache {
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struct entry {
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optional<expr> m_expr;
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expr m_result;
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};
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unsigned m_capacity;
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std::vector<entry> m_cache;
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std::vector<unsigned> m_used;
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public:
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expr_cache(unsigned c):m_capacity(c), m_cache(c) {}
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void insert(expr const & e, expr const & v);
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expr * find(expr const & e);
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void clear();
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};
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}
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