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// `self` is id<V2TIMSignalingListener>
[[V2TIMManager sharedInstance] addSimpleMsgListener:self];

class SimpleMsgListener final : public V2TIMSimpleMsgListener {
    // Members ...
};

// Note that `simpleMsgListener` should not be released before the IM SDK is uninitialized,
// otherwise the message callback cannot be called.
SimpleMsgListener simpleMsgListener;
V2TIMManager::GetInstance()->AddSimpleMsgListener(&simpleMsgListener);

/// Basic message callback of the IM SDK
@protocol V2TIMSimpleMsgListener <NSObject>
@optional

/// Received a one-to-one text message
- (void)onRecvC2CTextMessage:(NSString *)msgID  sender:(V2TIMUserInfo *)info text:(NSString *)text;

/// Received a custom one-to-one (signaling) message
- (void)onRecvC2CCustomMessage:(NSString *)msgID  sender:(V2TIMUserInfo *)info customData:(NSData *)data;

/// Received a group text message
- (void)onRecvGroupTextMessage:(NSString *)msgID groupID:(NSString *)groupID sender:(V2TIMGroupMemberInfo *)info text:(NSString *)text;

/// Received a custom group (signaling) message
- (void)onRecvGroupCustomMessage:(NSString *)msgID groupID:(NSString *)groupID sender:(V2TIMGroupMemberInfo *)info customData:(NSData *)data;
@end

class SimpleMsgListener final : public V2TIMSimpleMsgListener {
public:
    SimpleMsgListener() = default;
    ~SimpleMsgListener() override = default;

    // Received the one-to-one text message
    void OnRecvC2CTextMessage(const V2TIMString& msgID, const V2TIMUserFullInfo& sender,
                              const V2TIMString& text) override {}

    // Received the custom one-to-one (signaling) message
    void OnRecvC2CCustomMessage(const V2TIMString& msgID, const V2TIMUserFullInfo& sender,
                                const V2TIMBuffer& customData) override {}

    // Received the group text message
    void OnRecvGroupTextMessage(const V2TIMString& msgID, const V2TIMString& groupID,
                                const V2TIMGroupMemberFullInfo& sender, const V2TIMString& text) override {}

    // Received the custom group (signaling) message
    void OnRecvGroupCustomMessage(const V2TIMString& msgID, const V2TIMString& groupID,
                                  const V2TIMGroupMemberFullInfo& sender,
                                  const V2TIMBuffer& customData) override {}
};

// `self` is id<V2TIMSignalingListener>
[[V2TIMManager sharedInstance] removeSimpleMsgListener:self];

class SimpleMsgListener final : public V2TIMSimpleMsgListener {
    // Members ...
};

// `simpleMsgListener` is the instance of SimpleMsgListener
V2TIMManager::GetInstance()->RemoveSimpleMsgListener(&simpleMsgListener);

// `self` is id<V2TIMAdvancedMsgListener>
[[V2TIMManager sharedInstance] addAdvancedMsgListener:self];

class AdvancedMsgListener final : public V2TIMAdvancedMsgListener {
    // Members ...
};

// Note that `advancedMsgListener` should not be released before the IM SDK is uninitialized,
// otherwise the message callback cannot be called.
AdvancedMsgListener advancedMsgListener;
V2TIMManager::GetInstance()->GetMessageManager()->AddAdvancedMsgListener(&advancedMsgListener);

/// Advanced message listener
@protocol V2TIMAdvancedMsgListener <NSObject>
@optional
/// Received a new message
- (void)onRecvNewMessage:(V2TIMMessage *)msg;

/// Message read receipt notification (if read receipts are supported, the notification is received when the receiver calls `sendMessageReadReceipts`)
- (void)onRecvMessageReadReceipts:(NSArray<V2TIMMessageReceipt *> *)receiptList;

/// One-to-one message read notification (a notification is received when the receiver calls `markC2CMessageAsRead`)
- (void)onRecvC2CReadReceipt:(NSArray<V2TIMMessageReceipt *> *)receiptList;

/// Received a message recall notification
- (void)onRecvMessageRevoked:(NSString *)msgID;

/// The message content is modified
- (void)onRecvMessageModified:(V2TIMMessage *)msg;
@end

class AdvancedMsgListener final : public V2TIMAdvancedMsgListener {
public:
    AdvancedMsgListener() = default;
    ~AdvancedMsgListener() override = default;

    // Received a new message
    void OnRecvNewMessage(const V2TIMMessage& message) override {}

    // one-to-one message read notification (a notification is received when the receiver calls `markC2CMessageAsRead`)
    void OnRecvC2CReadReceipt(const V2TIMMessageReceiptVector& receiptList) override {}

    // Message read receipt notification (if read receipts are supported, the notification is received when the receiver calls `sendMessageReadReceipts`)
    void OnRecvMessageReadReceipts(const V2TIMMessageReceiptVector& receiptList) override {}

    // Received a message recall notification
    void OnRecvMessageRevoked(const V2TIMString& messageID) override {}

    // The message content is modified.
    void OnRecvMessageModified(const V2TIMMessage& message) override {}
};