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 that the 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/v2/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_v2;  auto client = language::LanguageServiceClient(      language::MakeLanguageServiceConnection());  google::cloud::language::v2::Document document;  document.set_type(google::cloud::language::v2::Document::PLAIN_TEXT);  document.set_content(kText);  document.set_language_code("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::v2::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

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.

• language_v1::LanguageServiceClient
• language_v2::LanguageServiceClient

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.