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tdlib-fork/td/telegram/MessageId.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/telegram/ScheduledServerMessageId.h"
#include "td/telegram/ServerMessageId.h"
#include "td/utils/common.h"
#include "td/utils/StringBuilder.h"
#include <functional>
#include <limits>
#include <type_traits>
namespace td {
enum class MessageType : int32 { None, Server, Local, YetUnsent };
class MessageId {
int64 id = 0;
static constexpr int32 SERVER_ID_SHIFT = 20;
static constexpr int32 SHORT_TYPE_MASK = (1 << 2) - 1;
static constexpr int32 TYPE_MASK = (1 << 3) - 1;
static constexpr int32 FULL_TYPE_MASK = (1 << SERVER_ID_SHIFT) - 1;
static constexpr int32 SCHEDULED_MASK = 4;
static constexpr int32 TYPE_YET_UNSENT = 1;
static constexpr int32 TYPE_LOCAL = 2;
friend StringBuilder &operator<<(StringBuilder &string_builder, MessageId message_id);
// ordinary message ID layout
// |-------31--------|---17---|1|--2-|
// |server_message_id|local_id|0|type|
// scheduled message ID layout
// |-------30-------|----18---|1|--2-|
// |send_date-2**30 |server_id|1|type|
ServerMessageId get_server_message_id_force() const;
ScheduledServerMessageId get_scheduled_server_message_id_force() const {
CHECK(is_scheduled());
return ScheduledServerMessageId(static_cast<int32>((id >> 3) & ((1 << 18) - 1)));
}
public:
MessageId() = default;
explicit MessageId(ServerMessageId server_message_id)
: id(static_cast<int64>(server_message_id.get()) << SERVER_ID_SHIFT) {
}
MessageId(ScheduledServerMessageId server_message_id, int32 send_date);
explicit constexpr MessageId(int64 message_id) : id(message_id) {
}
template <class T, typename = std::enable_if_t<std::is_convertible<T, int64>::value>>
MessageId(T message_id) = delete;
static constexpr MessageId min() {
return MessageId(static_cast<int64>(MessageId::TYPE_YET_UNSENT));
}
static constexpr MessageId max() {
return MessageId(static_cast<int64>(std::numeric_limits<int32>::max()) << SERVER_ID_SHIFT);
}
bool is_valid() const;
bool is_valid_scheduled() const;
int64 get() const {
return id;
}
MessageType get_type() const;
bool is_scheduled() const {
return (id & SCHEDULED_MASK) != 0;
}
bool is_yet_unsent() const {
CHECK(is_valid() || is_scheduled());
return (id & SHORT_TYPE_MASK) == TYPE_YET_UNSENT;
}
bool is_local() const {
CHECK(is_valid() || is_scheduled());
return (id & SHORT_TYPE_MASK) == TYPE_LOCAL;
}
bool is_server() const {
CHECK(is_valid());
return (id & FULL_TYPE_MASK) == 0;
}
bool is_scheduled_server() const {
CHECK(is_valid_scheduled());
return (id & SHORT_TYPE_MASK) == 0;
}
bool is_any_server() const {
return is_scheduled() ? is_scheduled_server() : is_server();
}
ServerMessageId get_server_message_id() const {
CHECK(id == 0 || is_server());
return get_server_message_id_force();
}
// returns greatest server message identifier not bigger than this message identifier
MessageId get_prev_server_message_id() const {
CHECK(!is_scheduled());
return MessageId(id & ~FULL_TYPE_MASK);
}
// returns smallest server message identifier not less than this message identifier
MessageId get_next_server_message_id() const {
CHECK(!is_scheduled());
return MessageId((id + FULL_TYPE_MASK) & ~FULL_TYPE_MASK);
}
MessageId get_next_message_id(MessageType type) const;
ScheduledServerMessageId get_scheduled_server_message_id() const {
CHECK(is_scheduled_server());
return get_scheduled_server_message_id_force();
}
bool operator==(const MessageId &other) const {
return id == other.id;
}
bool operator!=(const MessageId &other) const {
return id != other.id;
}
friend bool operator<(const MessageId &lhs, const MessageId &rhs) {
CHECK(lhs.is_scheduled() == rhs.is_scheduled());
return lhs.id < rhs.id;
}
friend bool operator>(const MessageId &lhs, const MessageId &rhs) {
return rhs < lhs;
}
friend bool operator<=(const MessageId &lhs, const MessageId &rhs) {
return !(rhs < lhs);
}
friend bool operator>=(const MessageId &lhs, const MessageId &rhs) {
return !(lhs < rhs);
}
template <class StorerT>
void store(StorerT &storer) const {
storer.store_long(id);
}
template <class ParserT>
void parse(ParserT &parser) {
id = parser.fetch_long();
}
};
struct MessageIdHash {
std::size_t operator()(MessageId message_id) const {
return std::hash<int64>()(message_id.get());
}
};
} // namespace td