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C++ Client Libraries | Google Cloud

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An idiomatic C++ client library for the Discovery Engine API, a service that powers high-quality content recommendations on your digital properties.

While this library is GA, please note that the Google Cloud C++ client libraries do not follow Semantic Versioning.

The following shows the code that you'll run in the google/cloud/discoveryengine/quickstart/ directory, which should give you a taste of the Discovery Engine API C++ client library API.

#include "google/cloud/discoveryengine/v1/document_client.h"
#include <iostream>

int main(int argc, char* argv[]) try {
  if (argc != 2) {
    std::cerr << "Usage: " << argv[0] << " project-id\n";
    return 1;
  }

  namespace discoveryengine = ::google::cloud::discoveryengine_v1;
  auto client = discoveryengine::DocumentServiceClient(
      discoveryengine::MakeDocumentServiceConnection());

  auto const parent = std::string{"projects/"} + argv[1] + "/locations/global" +
                      "/dataStores/default_data_store/branches/default_branch";
  for (auto d : client.ListDocuments(parent)) {
    if (!d) throw std::move(d).status();
    std::cout << d->DebugString() << "\n";
  }

  return 0;
} catch (google::cloud::Status const& status) {
  std::cerr << "google::cloud::Status thrown: " << status << "\n";
  return 1;
}

This library offers multiple *Client classes, which are listed below. Each one of these classes exposes all the RPCs for a service as member functions of the class. This library groups multiple services because they are part of the same product or are often used together. A typical example may be the administrative and data plane operations for a single product.

The library also has other classes that provide helpers, configuration parameters, and infrastructure to mock the *Client classes when testing your application.

• discoveryengine_v1::CompletionServiceClient
• discoveryengine_v1::ConversationalSearchServiceClient
• discoveryengine_v1::DocumentServiceClient
• discoveryengine_v1::SchemaServiceClient
• discoveryengine_v1::SearchServiceClient
• discoveryengine_v1::UserEventServiceClient

• Error Handling - describes how the library reports errors.
• How to Override the Default Endpoint - describes how to override the default endpoint.
• How to Override the Authentication Credentials - describes how to change the authentication credentials used by the library.
• Override Retry, Backoff, and Idempotency Policies - describes how to change the default retry policies.
• Environment Variables - describes environment variables that can configure the behavior of the library.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-08-14 UTC.

[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["The latest version of the Discovery Engine API C++ client library is 2.37.0-rc, with version 2.16.0 being the version of the page."],["This C++ client library is a GA release for the Discovery Engine API, which enables high-quality content recommendations on digital properties, however it does not follow Semantic Versioning."],["The library provides multiple `*Client` classes, such as `CompletionServiceClient`, `ConversationalSearchServiceClient`, `DocumentServiceClient`, `SchemaServiceClient`, `SearchServiceClient`, and `UserEventServiceClient`, each exposing RPCs for a specific service."],["The Discovery Engine API C++ client library also includes information on error handling, endpoint and authentication overrides, retry policies, and environment variables."],["A quick start example is included that demonstrates how to use the `DocumentServiceClient` to list documents."]]],[]]

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