mirror of
https://github.com/ton-blockchain/ton
synced 2025-03-09 15:40:10 +00:00
57 lines
1.6 KiB
C++
57 lines
1.6 KiB
C++
/*
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This file is part of TON Blockchain Library.
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TON Blockchain Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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TON Blockchain Library 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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with TON Blockchain Library. If not, see <http://www.gnu.org/licenses/>.
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Copyright 2017-2020 Telegram Systems LLP
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*/
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#pragma once
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#include "td/utils/common.h"
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#include <limits>
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#include <map>
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#include <tuple>
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namespace td {
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template <class ValueT>
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class Enumerator {
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public:
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using Key = int32;
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Key add(ValueT v) {
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CHECK(arr_.size() < static_cast<size_t>(std::numeric_limits<int32>::max() - 1));
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int32 next_id = static_cast<int32>(arr_.size() + 1);
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bool was_inserted;
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decltype(map_.begin()) it;
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std::tie(it, was_inserted) = map_.emplace(std::move(v), next_id);
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if (was_inserted) {
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arr_.push_back(&it->first);
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}
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return it->second;
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}
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const ValueT &get(Key key) const {
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auto pos = static_cast<size_t>(key - 1);
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CHECK(pos < arr_.size());
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return *arr_[pos];
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}
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private:
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std::map<ValueT, int32> map_;
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std::vector<const ValueT *> arr_;
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};
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} // namespace td
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