README.md

Cloud Natural Language API C++ Client Library

This directory contains 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 that the Google Cloud C++ client libraries do not follow Semantic Versioning.

Quickstart

The quickstart/ directory contains a minimal environment to get started using this client library in a larger project. The following "Hello World" program is used in this quickstart, and should give you a taste of this library.

#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 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_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;
}

More Information

• Official documentation about the Cloud Natural Language API service
• Reference doxygen documentation for each release of this client library
• Detailed header comments in our public .h files