32 lines
795 B
C
32 lines
795 B
C
|
/*
|
||
|
|
Copyright (c) 2015 Microsoft Corporation. All rights reserved.
|
||
|
|
Released under Apache 2.0 license as described in the file LICENSE.
|
||
|
|
|
||
|
|
Author: Leonardo de Moura
|
||
|
|
*/
|
||
|
|
#pragma once
|
||
|
|
#include <vector>
|
||
|
|
#include "kernel/expr.h"
|
||
|
|
|
||
|
|
namespace lean {
|
||
|
|
/** \brief Cache for storing mappings from expressions to expressions.
|
||
|
|
|
||
|
|
\warning The insert(k, v) method overwrites andy entry (k1, v1) when
|
||
|
|
hash(k) == hash(k1)
|
||
|
|
*/
|
||
|
|
class expr_cache {
|
||
|
|
struct entry {
|
||
|
|
optional<expr> m_expr;
|
||
|
|
expr m_result;
|
||
|
|
};
|
||
|
|
unsigned m_capacity;
|
||
|
|
std::vector<entry> m_cache;
|
||
|
|
std::vector<unsigned> m_used;
|
||
|
|
public:
|
||
|
|
expr_cache(unsigned c):m_capacity(c), m_cache(c) {}
|
||
|
|
void insert(expr const & e, expr const & v);
|
||
|
|
expr * find(expr const & e);
|
||
|
|
void clear();
|
||
|
|
};
|
||
|
|
}
|