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NSMutableArray *extensionList = [NSMutableArray array];
V2TIMMessageExtension *extension1 = [[V2TIMMessageExtension alloc] init];
extension1.extensionKey = @"key1";
extension1.extensionValue = @"value1";
[extensionList addObject:extension1];
V2TIMMessageExtension *extension2 = [[V2TIMMessageExtension alloc] init];
extension2.extensionKey = @"key2";
extension2.extensionValue = @"value2";
[extensionList addObject:extension2];
[[V2TIMManager sharedInstance] setMessageExtensions:message extensions:extensionList succ:^(NSArray<V2TIMMessageExtensionResult *> *extensionResultList) {
    // Set message extensions successfully
} fail:^(int code, NSString *desc) {
    // Failed to set message extensions
}];

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_;
};

V2TIMMessageExtensionVector extensionList;
V2TIMMessageExtension extension1;
extension1.extensionKey = "key1";
extension1.extensionValue = "value1";
extensionList.PushBack(extension1);
V2TIMMessageExtension extension2;
extension2.extensionKey = "key2";
extension2.extensionValue = "value2";
extensionList.PushBack(extension2);

auto *callback = new ValueCallback<V2TIMMessageExtensionResultVector>{};
callback->SetCallback(
    [=](const V2TIMMessageExtensionResultVector &extensionResultList) {
        // Set message extensions successfully
        delete callback;
    },
    [=](int error_code, const V2TIMString &error_message) {
        // Failed to set message extensions
        delete callback;
    });

V2TIMManager::GetInstance()->GetMessageManager()->SetMessageExtensions(message, extensionList, callback);

[[V2TIMManager sharedInstance] getMessageExtensions:message succ:^(NSArray<V2TIMMessageExtension *> *extensionList) {
    // Got message extensions successfully
} fail:^(int code, NSString *desc) {
    // Failed to get message extensions
}];

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<V2TIMMessageExtensionVector>{};
callback->SetCallback(
    [=](const V2TIMMessageExtensionVector &extensionList) {
        // Got message extensions successfully
        delete callback;
    },
    [=](int error_code, const V2TIMString &error_message) {
        // Failed to get message extensions
        delete callback;
    });

V2TIMManager::GetInstance()->GetMessageManager()->GetMessageExtensions(message, callback);

[[V2TIMManager sharedInstance] deleteMessageExtensions:message keys:@[@"key1",@"key2"] succ:^(NSArray<V2TIMMessageExtensionResult *> *extensionResultList){
    // Deleted message extensions successfully
} fail:^(int code, NSString *desc) {
    // Failed to delete message extensions
}];

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_;
};

V2TIMStringVector keys;
keys.PushBack("key1");
keys.PushBack("key2");

auto *callback = new ValueCallback<V2TIMMessageExtensionResultVector>{};
callback->SetCallback(
    [=](const V2TIMMessageExtensionResultVector &extensionResultList) {
        // Deleted message extensions successfully
        delete callback;
    },
    [=](int error_code, const V2TIMString &error_message) {
        // Failed to delete message extensions
        delete callback;
    });

V2TIMManager::GetInstance()->GetMessageManager()->DeleteMessageExtensions(message, keys, callback);