tdlight/td/telegram/UniqueId.h

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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2020
//
// 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 <atomic>
namespace td {
class UniqueId {
public:
enum Type : uint8 { Default, DcAuth, GetConfig, BindKey, TempFile };
static uint64 next() {
return next(Default, 0);
}
static uint64 next(Type type) {
return next(type, 0);
}
static uint64 next(Type type, uint8 key) {
// TODO: this is VERY ineffective
static std::atomic<uint64> current_id{1};
return ((current_id.fetch_add(1, std::memory_order_relaxed)) << 16) | (static_cast<uint64>(type) << 8) | key;
}
static uint8 extract_key(uint64 id) {
return static_cast<uint8>(id);
}
static Type extract_type(uint64 id) {
return static_cast<Type>(static_cast<uint8>(id >> 8));
}
};
} // namespace td