An idiomatic C++ client library forRecommender, a service on Google Cloud that provides usage recommendations and insights for Cloud products and services.
While this library isGA, please note Google Cloud C++ client libraries donotfollowSemantic Versioning.
Quickstart
The following shows the code that you'll run in thegoogle/cloud/recommender/quickstart/directory, which should give you a taste of the Recommender C++ client library API.
#include "google/cloud/recommender/v1/recommender_client.h"
#include "google/cloud/location.h"
#include <iostream>
int main(int argc, char* argv[]) try {
if (argc != 3) {
std::cerr << "Usage: " << argv[0] << " project-id location-id\n";
return 1;
}
auto const location = google::cloud::Location(argv[1], argv[2]);
namespace recommender = ::google::cloud::recommender_v1;
auto client =
recommender::RecommenderClient(recommender::MakeRecommenderConnection());
// For additional recommenders see:
// https://cloud.google.com/recommender/docs/recommenders#recommenders
auto const parent =
location.FullName() +
"/recommenders/google.compute.instance.MachineTypeRecommender";
for (auto r : client.ListRecommendations(parent)) {
if (!r) throw std::move(r).status();
std::cout << r->DebugString() << "\n";
}
return 0;
} catch (google::cloud::Status const& status) {
std::cerr << "google::cloud::Status thrown: " << status << "\n";
return 1;
}
Main classes
The main class in this library isrecommender_v1::RecommenderClient. All RPCs are exposed as member functions of this class. Other classes provide helpers, configuration parameters, and infrastructure to mockrecommender_v1::RecommenderClientwhen testing your application.
More Information
Error Handling- describes how the library reports errors.
[[["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 2025-09-04 UTC."],[[["\u003cp\u003eThis webpage provides documentation for the Recommender C++ Client Library, which is used to interact with the Google Cloud Recommender service for getting usage recommendations.\u003c/p\u003e\n"],["\u003cp\u003eThe latest version of the library is 2.37.0-rc, and the page also lists several previous versions, starting from 2.11.0 up to 2.36.0.\u003c/p\u003e\n"],["\u003cp\u003eThe Recommender C++ client library provides a \u003ccode\u003eRecommenderClient\u003c/code\u003e class for interacting with the Recommender service, with RPCs exposed as member functions.\u003c/p\u003e\n"],["\u003cp\u003eThe library does not follow Semantic Versioning despite being GA, and includes a quickstart example demonstrating its basic usage for listing recommendations.\u003c/p\u003e\n"],["\u003cp\u003eThe webpage also offers guidance on error handling, overriding default endpoints and authentication credentials, changing retry policies, and configuring the library's behavior using environment variables.\u003c/p\u003e\n"]]],[],null,["Version 2.28.0keyboard_arrow_down\n\n- [2.42.0-rc (latest)](/cpp/docs/reference/recommender/latest)\n- [2.41.0](/cpp/docs/reference/recommender/2.41.0)\n- [2.40.0](/cpp/docs/reference/recommender/2.40.0)\n- [2.39.0](/cpp/docs/reference/recommender/2.39.0)\n- [2.38.0](/cpp/docs/reference/recommender/2.38.0)\n- [2.37.0](/cpp/docs/reference/recommender/2.37.0)\n- [2.36.0](/cpp/docs/reference/recommender/2.36.0)\n- [2.35.0](/cpp/docs/reference/recommender/2.35.0)\n- [2.34.0](/cpp/docs/reference/recommender/2.34.0)\n- [2.33.0](/cpp/docs/reference/recommender/2.33.0)\n- [2.32.0](/cpp/docs/reference/recommender/2.32.0)\n- [2.31.0](/cpp/docs/reference/recommender/2.31.0)\n- [2.30.0](/cpp/docs/reference/recommender/2.30.0)\n- [2.29.0](/cpp/docs/reference/recommender/2.29.0)\n- [2.28.0](/cpp/docs/reference/recommender/2.28.0)\n- [2.27.0](/cpp/docs/reference/recommender/2.27.0)\n- [2.26.0](/cpp/docs/reference/recommender/2.26.0)\n- [2.25.1](/cpp/docs/reference/recommender/2.25.1)\n- [2.24.0](/cpp/docs/reference/recommender/2.24.0)\n- [2.23.0](/cpp/docs/reference/recommender/2.23.0)\n- [2.22.1](/cpp/docs/reference/recommender/2.22.1)\n- [2.21.0](/cpp/docs/reference/recommender/2.21.0)\n- [2.20.0](/cpp/docs/reference/recommender/2.20.0)\n- [2.19.0](/cpp/docs/reference/recommender/2.19.0)\n- [2.18.0](/cpp/docs/reference/recommender/2.18.0)\n- [2.17.0](/cpp/docs/reference/recommender/2.17.0)\n- [2.16.0](/cpp/docs/reference/recommender/2.16.0)\n- [2.15.1](/cpp/docs/reference/recommender/2.15.1)\n- [2.14.0](/cpp/docs/reference/recommender/2.14.0)\n- [2.13.0](/cpp/docs/reference/recommender/2.13.0)\n- [2.12.0](/cpp/docs/reference/recommender/2.12.0)\n- [2.11.0](/cpp/docs/reference/recommender/2.11.0) \n\nRecommender C++ Client Library\n==============================\n\nAn idiomatic C++ client library for [Recommender](https://cloud.google.com/recommender), a service on Google Cloud that provides usage recommendations and insights for Cloud products and services.\n\nWhile this library is **GA** , please note Google Cloud C++ client libraries do **not** follow [Semantic Versioning](https://semver.org/).\n\n### Quickstart\n\nThe following shows the code that you'll run in the `google/cloud/recommender/quickstart/` directory, which should give you a taste of the Recommender C++ client library API. \n\n #include \"google/cloud/recommender/v1/recommender_client.h\"\n #include \"google/cloud/location.h\"\n #include \u003ciostream\u003e\n\n int main(int argc, char* argv[]) try {\n if (argc != 3) {\n std::cerr \u003c\u003c \"Usage: \" \u003c\u003c argv[0] \u003c\u003c \" project-id location-id\\n\";\n return 1;\n }\n\n auto const location = google::cloud::Location(argv[1], argv[2]);\n\n namespace recommender = ::google::cloud::recommender_v1;\n auto client =\n recommender::RecommenderClient(recommender::MakeRecommenderConnection());\n // For additional recommenders see:\n // https://cloud.google.com/recommender/docs/recommenders#recommenders\n auto const parent =\n location.FullName() +\n \"/recommenders/google.compute.instance.MachineTypeRecommender\";\n for (auto r : client.ListRecommendations(parent)) {\n if (!r) throw std::move(r).status();\n std::cout \u003c\u003c r-\u003eDebugString() \u003c\u003c \"\\n\";\n }\n\n return 0;\n } catch (google::cloud::Status const& status) {\n std::cerr \u003c\u003c \"google::cloud::Status thrown: \" \u003c\u003c status \u003c\u003c \"\\n\";\n return 1;\n }\n\n### Main classes\n\nThe main class in this library is [`recommender_v1::RecommenderClient`](/cpp/docs/reference/recommender/2.28.0/classgoogle_1_1cloud_1_1recommender__v1_1_1RecommenderClient). All RPCs are exposed as member functions of this class. Other classes provide helpers, configuration parameters, and infrastructure to mock [`recommender_v1::RecommenderClient`](/cpp/docs/reference/recommender/2.28.0/classgoogle_1_1cloud_1_1recommender__v1_1_1RecommenderClient) when testing your application.\n\n### More Information\n\n- [Error Handling](https://cloud.google.com/cpp/docs/reference/common/latest/common-error-handling.html) - describes how the library reports errors.\n- [How to Override the Default Endpoint](/cpp/docs/reference/recommender/2.28.0/recommender-override-endpoint) - describes how to override the default endpoint.\n- [How to Override the Authentication Credentials](/cpp/docs/reference/recommender/2.28.0/recommender-override-authentication) - describes how to change the authentication credentials used by the library.\n- [Override Retry, Backoff, and Idempotency Policies](/cpp/docs/reference/recommender/2.28.0/recommender-override-retry) - describes how to change the default retry policies.\n- [Environment Variables](/cpp/docs/reference/recommender/2.28.0/recommender-env) - describes environment variables that can configure the behavior of the library."]]