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C++ Client Libraries | Google Cloud

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Discovery Engine API C++ Client Library

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.

Quickstart

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 "google/cloud/location.h"
#include <iostream>

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

  auto const location = google::cloud::Location(argv[1], "global");

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

  auto const parent = location.FullName() +
                      "/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;
}
Main classes

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.

More Information

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."],[[["This page provides documentation for the Discovery Engine API C++ client library, designed to enhance content recommendations on digital platforms."],["The library offers multiple `*Client` classes, such as `CompletionServiceClient` and `DocumentServiceClient`, each exposing RPCs for a specific service within the Discovery Engine API."],["Version 2.37.0-rc is the latest version available, while a full list of previous releases can be seen with versions going as far back as 2.15.1."],["The C++ client libraries do not adhere to Semantic Versioning, and the library is considered GA."],["The documentation includes information on error handling, endpoint overrides, authentication overrides, retry policies, and environment variables for customizing library behavior."]]],[]]

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