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[[V2TIMManager sharedInstance] pinGroupMessage:self.groupID message:message isPinned:YES succ:^{
    // Message pinning succeeded.
} fail:^(int code, NSString *desc) {
    // Message pinning failed.
}];

class Callback final : public V2TIMCallback {
public:
    using SuccessCallback = std::function<void()>;
    using ErrorCallback = std::function<void(int, const V2TIMString &)>;
    Callback() = default;
    ~Callback() override = default;
    void SetCallback(SuccessCallback success_callback, ErrorCallback error_callback) {
        success_callback_ = std::move(success_callback);
        error_callback_ = std::move(error_callback);
    }
    void OnSuccess() override {
        if (success_callback_) {
            success_callback_();
        }
    }
    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_;
};

auto *callback = new Callback{};
callback->SetCallback(
    [=]() {
        // Message pinning succeeded.
        delete callback;
    },
    [=](int error_code, const V2TIMString & error_message) {
        // Message pinning failed.
        delete callback;
    });
V2TIMManager::GetInstance()->GetMessageManager()->PinGroupMessage(groupID, message, true, callback);

[[V2TIMManager sharedInstance] getPinnedGroupMessageList:self.groupID succ:^(NSArray<V2TIMMessage *> *messageList) {
        // Succeeded in obtaining the pinned message list.
} fail:^(int code, NSString *desc) {
        // Failed to obtain the pinned message list.
}];


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_;
};

auto callback = new ValueCallback<V2TIMMessageVector>{};
callback->SetCallback(
    [=](const V2TIMMessageVector& messageVector) {
        // Succeeded in obtaining the pinned message list.
        delete callback;
    },
    [=](int error_code, const V2TIMString & error_message) {
        // Failed to obtain the pinned message list.
        delete callback;
    });

V2TIMManager::GetInstance()->GetMessageManager()->GetPinnedGroupMessageList(groupID, callback);

[[V2TIMManager sharedInstance] addAdvancedMsgListener:self];
- (void)onGroupMessagePinned:(NSString *)groupID message:(V2TIMMessage *)message isPinned:(BOOL)isPinned opUser:(V2TIMGroupMemberInfo *)opUser {
      // Receives notification of changes to the pinned message list.
}

V2TIMManager::GetInstance()->GetMessageManager()->AddAdvancedMsgListener(this);
void OnGroupMessagePinned(const V2TIMString &groupID, const V2TIMMessage &message,
                          bool isPinned, const V2TIMGroupMemberInfo &opUser) override {
     // Receives notification of changes to the pinned message list.
}