Cloud Natural Language API C++ Client Library

An idiomatic C++ client library for the Cloud 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 is GA, please note Google Cloud C++ client libraries do not follow Semantic Versioning.

Quickstart

The following shows the code that you'll run in the google/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 this
continent, a new nation, conceived in Liberty, and dedicated to
the 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 is language_v1::LanguageServiceClient. All RPCs are exposed as member functions of this class. Other classes provide helpers, configuration parameters, and infrastructure to mock language_v1::LanguageServiceClient when testing your application.

Retry, Backoff, and Idempotency Policies.

The library automatically retries requests that fail with transient errors, and uses exponential backoff to backoff between retries. Application developers can override the default policies.

More Information