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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| #pragma once | ||
| //------------------------------------------------------------------------------ | ||
| // | ||
| // Copyright 2018-2019 Fetch.AI Limited | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
| // | ||
| //------------------------------------------------------------------------------ | ||
|
|
||
| #include <type_traits> | ||
| #include <unordered_map> | ||
|
|
||
| namespace fetch { | ||
| namespace core { | ||
|
|
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| template <typename Key, typename Value> | ||
| class Mapping | ||
| { | ||
| public: | ||
| // Construction / Destruction | ||
| Mapping() = default; | ||
| Mapping(Mapping const &) = default; | ||
| Mapping(Mapping &&) noexcept = default; | ||
| ~Mapping() = default; | ||
|
|
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| bool Lookup(Key const &key, Value &value); | ||
| bool Lookup(Value const &value, Key &key); | ||
| void Update(Key const &key, Value const &value); | ||
|
|
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| // Operators | ||
| Mapping &operator=(Mapping const &) = default; | ||
| Mapping &operator=(Mapping &&) noexcept = default; | ||
|
|
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| private: | ||
| using ForwardIndex = std::unordered_map<Key, Value>; | ||
| using ReverseIndex = std::unordered_map<Value, Key>; | ||
|
|
||
| ForwardIndex forward_index_; | ||
| ReverseIndex reverse_index_; | ||
|
|
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| static_assert(!std::is_same<Key, Value>::value, ""); | ||
| }; | ||
|
|
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| template <typename K, typename V> | ||
| bool Mapping<K, V>::Lookup(K const &key, V &value) | ||
| { | ||
| bool success{false}; | ||
|
|
||
| auto const it = forward_index_.find(key); | ||
| if (it != forward_index_.end()) | ||
| { | ||
| value = it->second; | ||
| success = true; | ||
| } | ||
|
|
||
| return success; | ||
| } | ||
|
|
||
| template <typename K, typename V> | ||
| bool Mapping<K, V>::Lookup(V const &value, K &key) | ||
| { | ||
| bool success{false}; | ||
|
|
||
| auto const it = reverse_index_.find(value); | ||
| if (it != reverse_index_.end()) | ||
| { | ||
| key = it->second; | ||
| success = true; | ||
| } | ||
|
|
||
| return success; | ||
| } | ||
|
|
||
| template <typename K, typename V> | ||
| void Mapping<K, V>::Update(K const &key, V const &value) | ||
| { | ||
| // update the forward map | ||
| auto const forward_it = forward_index_.find(key); | ||
| if (forward_it == forward_index_.end()) | ||
| { | ||
| forward_index_.emplace(key, value); | ||
| } | ||
| else | ||
| { | ||
| forward_it->second = value; | ||
| } | ||
|
|
||
| // update the reverse map | ||
| auto const reverse_it = reverse_index_.find(value); | ||
| if (reverse_it == reverse_index_.end()) | ||
| { | ||
| reverse_index_.emplace(value, key); | ||
| } | ||
| else | ||
| { | ||
| reverse_it->second = key; | ||
| } | ||
| } | ||
|
|
||
| } // namespace core | ||
| } // namespace fetch |
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