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tdlib-fork/tdutils/td/utils/ChangesProcessor.h

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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2019
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#pragma once
#include "td/utils/common.h"
#include <utility>
namespace td {
// Process changes after they are finished in order of addition
template <class DataT>
class ChangesProcessor {
public:
using Id = uint64;
void clear() {
offset_ += data_array_.size();
ready_i_ = 0;
data_array_.clear();
}
template <class FromDataT>
Id add(FromDataT &&data) {
auto res = offset_ + data_array_.size();
data_array_.emplace_back(std::forward<DataT>(data), false);
return static_cast<Id>(res);
}
template <class F>
void finish(Id token, F &&func) {
size_t pos = static_cast<size_t>(token) - offset_;
if (pos >= data_array_.size()) {
return;
}
data_array_[pos].second = true;
while (ready_i_ < data_array_.size() && data_array_[ready_i_].second == true) {
func(std::move(data_array_[ready_i_].first));
ready_i_++;
}
try_compactify();
}
private:
size_t offset_ = 1;
size_t ready_i_ = 0;
std::vector<std::pair<DataT, bool>> data_array_;
void try_compactify() {
if (ready_i_ > 5 && ready_i_ * 2 > data_array_.size()) {
data_array_.erase(data_array_.begin(), data_array_.begin() + ready_i_);
offset_ += ready_i_;
ready_i_ = 0;
}
}
};
} // namespace td