mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
95 lines
2.0 KiB
C++
95 lines
2.0 KiB
C++
/*
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This file is part of solidity.
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solidity is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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solidity is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with solidity. If not, see <http://www.gnu.org/licenses/>.
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*/
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// SPDX-License-Identifier: GPL-3.0
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#pragma once
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#include <map>
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#include <set>
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/**
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* Data structure that keeps track of values and keys of a mapping.
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*/
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template <class K, class V>
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struct InvertibleMap
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{
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std::map<K, V> values;
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// references[x] == {y | values[y] == x}
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std::map<V, std::set<K>> references;
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void set(K _key, V _value)
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{
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if (values.count(_key))
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references[values[_key]].erase(_key);
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values[_key] = _value;
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references[_value].insert(_key);
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}
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void eraseKey(K _key)
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{
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if (values.count(_key))
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references[values[_key]].erase(_key);
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values.erase(_key);
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}
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void eraseValue(V _value)
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{
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if (references.count(_value))
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{
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for (V v: references[_value])
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values.erase(v);
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references.erase(_value);
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}
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}
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void clear()
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{
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values.clear();
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references.clear();
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}
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};
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template <class T>
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struct InvertibleRelation
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{
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/// forward[x] contains y <=> backward[y] contains x
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std::map<T, std::set<T>> forward;
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std::map<T, std::set<T>> backward;
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void insert(T _key, T _value)
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{
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forward[_key].insert(_value);
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backward[_value].insert(_key);
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}
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void set(T _key, std::set<T> _values)
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{
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for (T v: forward[_key])
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backward[v].erase(_key);
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for (T v: _values)
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backward[v].insert(_key);
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forward[_key] = std::move(_values);
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}
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void eraseKey(T _key)
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{
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for (auto const& v: forward[_key])
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backward[v].erase(_key);
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forward.erase(_key);
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}
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};
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