Cloud Natural Language API C++ Client Library
An idiomatic C++ client library for theCloud Natural Language API, a service that provides natural language understanding technologies, such as sentiment analysis, entity recognition, entity sentiment analysis, and other text annotations.
While this library isGA, please note Google Cloud C++ client libraries donot followSemantic Versioning.
Quickstart
The following shows the code that you'll run in thegoogle/cloud/language/quickstart/ directory, which should give you a taste of the Cloud Natural Language API C++ client library API.
#include "google/cloud/language/v1/language_client.h"#include <iostream>auto constexpr kText = R"""(Four score and seven years ago our fathers brought forth on thiscontinent, a new nation, conceived in Liberty, and dedicated tothe proposition that all men are created equal.)""";int main(int argc, char* argv[]) try { if (argc != 1) { std::cerr << "Usage: " << argv[0] << "\n"; return 1; } namespace language = ::google::cloud::language_v1; auto client = language::LanguageServiceClient( language::MakeLanguageServiceConnection()); google::cloud::language::v1::Document document; document.set_type(google::cloud::language::v1::Document::PLAIN_TEXT); document.set_content(kText); document.set_language("en-US"); auto response = client.AnalyzeEntities(document); if (!response) throw std::move(response).status(); for (auto const& entity : response->entities()) { if (entity.type() != google::cloud::language::v1::Entity::NUMBER) continue; std::cout << entity.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 islanguage_v1::LanguageServiceClient. All RPCs are exposed as member functions of this class. Other classes provide helpers, configuration parameters, and infrastructure to mocklanguage_v1::LanguageServiceClient when testing your application.
More Information
- 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.
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Last updated 2025-12-17 UTC.