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// List of messages to be forwarded, which can contain combined messages but not group tips
NSArray *msgs = @[message1,message2...];  
// Title of the combined message
NSString *title = @"Chat History of vinson and lynx";  
// Digest list of the combined message
NSArray *abstactList = @[@"abstract1",@"abstract2",@"abstract3"]; 
// Compatibility text of the combined message. If the SDK on an early version does not support the combined message, the user will receive a text message with the content `compatibleText` by default.
NSString *compatibleText = @"Upgrade to the latest version to check the merged message"; 
// Create a combined message
V2TIMMessage *mergeMessage = [[V2TIMManager sharedInstance] createMergerMessage:msgs title:title 
abstractList:abstactList compatibleText:compatibleText];

// List of messages to be forwarded, which can contain combined messages but not group tips
V2TIMMessageVector messageList;
messageList.PushBack(message1);
messageList.PushBack(message2);
// Title of the combined message
V2TIMString title = "Chat History of vinson and lynx";
// Digest list of the combined message
V2TIMStringVector abstractList;
abstractList.PushBack("abstract1");
abstractList.PushBack("abstract2");
abstractList.PushBack("abstract3");
// Compatibility text of the combined message. If the early SDK version does not support the combined message,
// the user will receive a text message with the content `compatibleText` by default.
V2TIMString compatibleText = "Upgrade to the latest version to check the merged message";
// Create a combined message
V2TIMMessage mergerMessage = V2TIMManager::GetInstance()->GetMessageManager()->CreateMergerMessage(
messageList, title, abstractList, compatibleText);

// Send the combined message to the user `denny`
[[V2TIMManager sharedInstance] sendMessage:mergeMessage receiver:@"denny"  groupID:nil
 priority:V2TIM_PRIORITY_NORMAL  onlineUserOnly:NO  offlinePushInfo:nil progress:nil succ:nil fail:nil];

class SendCallback final : public V2TIMSendCallback {
public:
    using SuccessCallback = std::function<void(const V2TIMMessage&)>;
    using ErrorCallback = std::function<void(int, const V2TIMString&)>;
    using ProgressCallback = std::function<void(uint32_t)>;

    SendCallback() = default;
    ~SendCallback() override = default;

    void SetCallback(SuccessCallback success_callback, ErrorCallback error_callback,
                     ProgressCallback progress_callback) {
        success_callback_ = std::move(success_callback);
        error_callback_ = std::move(error_callback);
        progress_callback_ = std::move(progress_callback);
    }

    void OnSuccess(const V2TIMMessage& message) override {
        if (success_callback_) {
            success_callback_(message);
        }
    }
    void OnError(int error_code, const V2TIMString& error_message) override {
        if (error_callback_) {
            error_callback_(error_code, error_message);
        }
    }
    void OnProgress(uint32_t progress) override {
        if (progress_callback_) {
            progress_callback_(progress);
        }
    }

private:
    SuccessCallback success_callback_;
    ErrorCallback error_callback_;
    ProgressCallback progress_callback_;
};

auto callback = new SendCallback{};
callback->SetCallback([=](const V2TIMMessage& message) { delete callback; },
                      [=](int error_code, const V2TIMString& error_message) { delete callback; },
                      [=](uint32_t progress) {});

V2TIMManager::GetInstance()->GetMessageManager()->SendMessage(
    mergerMessage, "denny", {}, V2TIMMessagePriority::V2TIM_PRIORITY_NORMAL, false, {}, callback);

// `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);

- (void)onRecvNewMessage:(V2TIMMessage *)msg {
    if (msg.elemType == V2TIM_ELEM_TYPE_MERGER) {
        // Get the elements of the combined message
        V2TIMMergerElem *mergerElem = msg.mergerElem;
        // Get the `title`
        NSString *title = mergerElem.title;
        // Get the digest list
        NSArray *abstractList = mergerElem.abstractList;
        // Download the combined message list when the user clicks the combined message
        [msg.mergerElem downloadMergerMessage:^(NSArray<V2TIMMessage *> *msgs) {
            // Downloaded successfully. `msgs` is the combined message list.
            for (V2TIMMessage *subMsg in msgs) {
                // If the combined message list still contains a combined message, continue to parse the message.
                if (subMsg.elemType == V2TIM_ELEM_TYPE_MERGER) {
                    V2TIMMergerElem *mergerElem = subMsg.mergerElem;
                    // Get the `title`
                    NSString *title = mergerElem.title;
                    // Get the digest list
                    NSArray *abstractList = mergerElem.abstractList;
                    // Download the combined message list when the user clicks the combined message
                    [msg.mergerElem downloadMergerMessage:nil fail:nil];
                }
            }
        } fail:^(int code, NSString *desc) {
            // Download failed
        }];
    }
}

template <class T>
class ValueCallback final : public V2TIMValueCallback<T> {
public:
    using SuccessCallback = std::function<void(const T&)>;
    using ErrorCallback = std::function<void(int, const V2TIMString&)>;

    ValueCallback() = default;
    ~ValueCallback() override = default;

    void SetCallback(SuccessCallback success_callback, ErrorCallback error_callback) {
        success_callback_ = std::move(success_callback);
        error_callback_ = std::move(error_callback);
    }

    void OnSuccess(const T& value) override {
        if (success_callback_) {
            success_callback_(value);
        }
    }
    void OnError(int error_code, const V2TIMString& error_message) override {
        if (error_callback_) {
            error_callback_(error_code, error_message);
        }
    }

private:
    SuccessCallback success_callback_;
    ErrorCallback error_callback_;
};

class AdvancedMsgListener final : public V2TIMAdvancedMsgListener {
public:
    void OnRecvNewMessage(const V2TIMMessage& message) override {
        if (message.elemList.Size() == 1) {
            V2TIMElem* elem = message.elemList[0];
            if (elem->elemType == V2TIMElemType::V2TIM_ELEM_TYPE_MERGER) {
                // Get the elements of the combined message
                auto mergerElem = static_cast<V2TIMMergerElem*>(elem);
                // Get the `title`
                V2TIMString title = mergerElem->title;
                /// Get the digest list
                V2TIMStringVector abstractList = mergerElem->abstractList;

                // Download the combined message list when the user clicks the combined message
                auto callback = new ValueCallback<V2TIMMessageVector>{};
                callback->SetCallback(
                    [=](const V2TIMMessageVector& messageList) {
                        // Downloaded successfully. `v2TIMMessages` is the combined message list.
                        for (size_t i = 0; i < messageList.Size(); ++i) {
                            const V2TIMMessage& message = messageList[i];
                            if (message.elemList.Size() == 1) {
                                V2TIMElem* elem = message.elemList[0];
                                // If the combined message list still contains a combined message, continue to parse the message.
                                if (elem->elemType == V2TIMElemType::V2TIM_ELEM_TYPE_MERGER) {
                                    // ...
                                }
                            }
                        }
                        delete callback;
                    },
                    [=](int error_code, const V2TIMString& error_message) { delete callback; });

                mergerElem->DownloadMergerMessage(callback);
            }
        }
    }
    // Other 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);