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[[V2TIMManager sharedInstance] addGroupListener:self];

// Group member notification, group lifecycle notification, group join request notification, topic event listening callback, etc.
- (void)onMemberEnter:(NSString *)groupID memberList:(NSArray<V2TIMGroupMemberInfo *>*)memberList {
    // A member joined the group. All the group members can receive the notification.
}

- (void)onMemberLeave:(NSString *)groupID member:(V2TIMGroupMemberInfo *)member {
    // A member left the group. All the group members can receive the notification.
}

- (void)onReceiveRESTCustomData:(NSString *)groupID data:(NSData *)data {
    // Custom system notification sent by the server
}

class GroupListener final : public V2TIMGroupListener {
public:
    GroupListener() = default;
    ~GroupListener() override = default;

    // Group member notification, group lifecycle notification, group join request notification, topic event listening callback, etc.

    void OnMemberEnter(const V2TIMString& groupID, const V2TIMGroupMemberInfoVector& memberList) override {
        // A member joined the group. All the group members can receive the notification.
    }

    void OnMemberLeave(const V2TIMString& groupID, const V2TIMGroupMemberInfo& member) override {
        // A member left the group. All the group members can receive the notification.
    }

    void OnReceiveRESTCustomData(const V2TIMString& groupID, const V2TIMBuffer& customData) override {
        // Custom system notification sent by the server
    }
};

// Add a group event listener. Keep `groupListener` valid before the listener is removed to ensure event callbacks are received.
GroupListener groupListener;
V2TIMManager::GetInstance()->AddGroupListener(&groupListener);

// Create a group
[[V2TIMManager sharedInstance] createGroup:GroupType_Work groupID:nil groupName:@"groupA" succ:^(NSString *groupID) {
    // Group created successfully
} fail:^(int code, NSString *desc) {
    // Failed to create the group
}];

// Listen for the group creation notification
[[V2TIMManager sharedInstance] addGroupListener:self];
- (void)onGroupCreated:(NSString *)groupID {
    // A group was created. `groupID` is the ID of the created group.
}

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<V2TIMString>{};
callback->SetCallback(
    [=](const V2TIMString& string) {
        // Group created successfully
        delete callback;
    },
    [=](int error_code, const V2TIMString& error_message) {
        // Failed to create the group
        delete callback;
    });

V2TIMManager::GetInstance()->CreateGroup("Work", {}, "groupA", callback);

// Listen for the group creation notification
class GroupListener final : public V2TIMGroupListener {
public:
    GroupListener() = default;
    ~GroupListener() override = default;

    void OnGroupCreated(const V2TIMString& groupID) override {
        // A group was created. `groupID` is the ID of the created group.
    }
    // Other members …
};
// Add a group event listener. Keep `groupListener` valid before the listener is removed to ensure event callbacks are received.
GroupListener groupListener;
V2TIMManager::GetInstance()->AddGroupListener(&groupListener);

// Use the `createGroup` advanced API to create a work group 
V2TIMGroupInfo *info = [[V2TIMGroupInfo alloc] init];
info.groupName = @"testWork";
info.groupType = @"Work";
NSMutableArray *memberList = [NSMutableArray array];
V2TIMCreateGroupMemberInfo *memberInfo = [[V2TIMCreateGroupMemberInfo alloc] init];
memberInfo.userID = @"vinson";
[memberList addObject:memberInfo];
[[V2TIMManager sharedInstance] createGroup:info memberList:memberList succ:^(NSString *groupID) {
    // Group created successfully
} fail:^(int code, NSString *msg) {
    // Failed to create the group
}];

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_;
};

// Use the `createGroup` advanced API to create a work group
V2TIMGroupInfo info;
info.groupType = "Work";
info.groupName = "testWork";
info.introduction = "this is a test Work group";

V2TIMCreateGroupMemberInfoVector memberInfoList;
V2TIMCreateGroupMemberInfo memberInfo1;
memberInfo1.userID = "vinson";
memberInfoList.PushBack(memberInfo1);
V2TIMCreateGroupMemberInfo memberInfo2;
memberInfo2.userID = "park";
memberInfoList.PushBack(memberInfo2);

auto callback = new ValueCallback<V2TIMString>{};
callback->SetCallback(
    [=](const V2TIMString& string) {
        // Group created successfully
        delete callback;
    },
    [=](int error_code, const V2TIMString& error_message) {
        // Creation failed
        delete callback;
    });

V2TIMManager::GetInstance()->GetGroupManager()->CreateGroup(info, memberInfoList, callback);