37 lines
1.6 KiB
C++
37 lines
1.6 KiB
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 <utility>
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#include "util/hash.h"
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#include "kernel/expr.h"
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#include "library/expr_lt.h"
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namespace lean {
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typedef pair<expr, expr> expr_pair;
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/** \brief Functional object for hashing expression pairs. */
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struct expr_pair_hash {
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unsigned operator()(expr_pair const & p) const { return hash(p.first.hash(), p.second.hash()); }
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};
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/** \brief Functional object for hashing expression pairs (based on their allocation time). */
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struct expr_pair_hash_alloc {
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unsigned operator()(expr_pair const & p) const { return hash(p.first.hash_alloc(), p.second.hash_alloc()); }
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};
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/** \brief Functional object for comparing expression pairs. */
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struct expr_pair_eq {
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bool operator()(expr_pair const & p1, expr_pair const & p2) const { return p1.first == p2.first && p1.second == p2.second; }
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};
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/** \brief Functional object for comparing expression pairs using pointer equality. */
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struct expr_pair_eqp {
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bool operator()(expr_pair const & p1, expr_pair const & p2) const { return is_eqp(p1.first, p2.first) && is_eqp(p1.second, p2.second); }
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};
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inline bool is_lt(expr_pair const & p1, expr_pair const & p2, bool use_hash) {
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return is_lt(p1.first, p2.first, use_hash) || (p1.first == p2.first && is_lt(p1.second, p2.second, use_hash));
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}
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struct expr_pair_quick_cmp {
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int operator()(expr_pair const & p1, expr_pair const & p2) const { return is_lt(p1, p2, true) ? -1 : (p1 == p2 ? 0 : 1); }
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};
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}
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