62 lines
1.5 KiB
C++
62 lines
1.5 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2020
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#pragma once
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#include "td/utils/common.h"
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#include <utility>
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namespace td {
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// Process changes after they are finished in order of addition
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template <class DataT>
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class ChangesProcessor {
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public:
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using Id = uint64;
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void clear() {
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offset_ += data_array_.size();
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ready_i_ = 0;
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data_array_.clear();
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}
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template <class FromDataT>
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Id add(FromDataT &&data) {
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auto res = offset_ + data_array_.size();
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data_array_.emplace_back(std::forward<DataT>(data), false);
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return static_cast<Id>(res);
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}
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template <class F>
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void finish(Id token, F &&func) {
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size_t pos = static_cast<size_t>(token) - offset_;
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if (pos >= data_array_.size()) {
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return;
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}
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data_array_[pos].second = true;
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while (ready_i_ < data_array_.size() && data_array_[ready_i_].second == true) {
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func(std::move(data_array_[ready_i_].first));
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ready_i_++;
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}
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try_compactify();
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}
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private:
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size_t offset_ = 1;
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size_t ready_i_ = 0;
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std::vector<std::pair<DataT, bool>> data_array_;
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void try_compactify() {
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if (ready_i_ > 5 && ready_i_ * 2 > data_array_.size()) {
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data_array_.erase(data_array_.begin(), data_array_.begin() + ready_i_);
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offset_ += ready_i_;
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ready_i_ = 0;
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}
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}
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};
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} // namespace td
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