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/*========================== begin_copyright_notice ============================
Copyright (C) 2017-2021 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
/*========================== begin_copyright_notice ============================
This file is distributed under the University of Illinois Open Source License.
See LICENSE.TXT for details.
============================= end_copyright_notice ===========================*/
#pragma once
#include <map>
#include <list>
namespace IGC {
/// This class implements a map that also provides access to all stored values
/// in a deterministic order. The values are kept in a std::list and the
/// mapping is done with DenseMap from Keys to indexes in that vector.
/// Inspired by LLVM's stable data-structures.
template <typename KeyT, typename ValueT> class MapList {
typedef std::list<std::pair<KeyT, ValueT> > ListType;
typedef typename ListType::iterator iterator_type;
typedef std::map<KeyT, iterator_type> MapType;
typedef typename ListType::size_type SizeType;
MapType Map;
ListType List;
public:
typedef iterator_type iterator;
typedef typename ListType::const_iterator const_iterator;
SizeType size() const {
return List.size();
}
iterator begin() {
return List.begin();
}
const_iterator begin() const {
return List.begin();
}
iterator end() {
return List.end();
}
const_iterator end() const {
return List.end();
}
bool empty() const {
return List.empty();
}
std::pair<KeyT, ValueT>& front() { return List.front(); }
const std::pair<KeyT, ValueT>& front() const { return List.front(); }
std::pair<KeyT, ValueT>& back() { return List.back(); }
const std::pair<KeyT, ValueT>& back() const { return List.back(); }
void clear() {
Map.clear();
List.clear();
}
ValueT& operator[](const KeyT& Key) {
std::pair<KeyT, iterator> Pair = std::make_pair(Key, end());
std::pair<typename MapType::iterator, bool> Result = Map.insert(Pair);
iterator& I = Result.first->second;
if (Result.second)
I = List.insert(end(), std::make_pair(Key, ValueT()));
return (*I).second;
}
ValueT lookup(const KeyT& Key) const {
typename MapType::const_iterator Pos = Map.find(Key);
return Pos == Map.end() ? ValueT() : *(Pos->second).second;
}
std::pair<iterator, bool> insert(const std::pair<KeyT, ValueT>& KV) {
std::pair<KeyT, iterator> Pair = std::make_pair(KV.first, end());
std::pair<typename MapType::iterator, bool> Result = Map.insert(Pair);
iterator& I = Result.first->second;
if (Result.second) {
I = List.insert(end(), std::make_pair(KV.first, KV.second));
return std::make_pair(I, true);
}
return std::make_pair(I, false);
}
unsigned count(const KeyT& Key) const {
typename MapType::const_iterator Pos = Map.find(Key);
return Pos == Map.end() ? 0 : 1;
}
iterator find(const KeyT& Key) {
typename MapType::const_iterator Pos = Map.find(Key);
return Pos == Map.end() ? end() : Pos->second;
}
const_iterator find(const KeyT& Key) const {
typename MapType::const_iterator Pos = Map.find(Key);
return Pos == Map.end() ? end() : Pos->second;
}
void pop_back() {
typename MapType::iterator Pos = Map.find(back().first);
Map.erase(Pos);
List.pop_back();
}
void erase(iterator I) {
typename MapType::iterator Pos = Map.find((*I).first);
Map.erase(Pos);
List.erase(I);
}
};
}
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