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.

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