Cloud Translation API C++ Client Library

An idiomatic C++ client library for the Cloud Translation API, a service to integrate text translation into your website or application.

While this library is GA, please note Google Cloud C++ client libraries do not follow Semantic Versioning.


The following shows the code that you'll run in the google/cloud/translate/quickstart/ directory, which should give you a taste of the Cloud Translation API C++ client library API.

#include "google/cloud/translate/v3/translation_client.h"
#include "google/cloud/project.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 < 2 || argc > 3) {
    std::cerr << "Usage: " << argv[0] << " project-id "
              << "[target-language (default: es-419)]\n";
    return 1;

  namespace translate = ::google::cloud::translate_v3;
  auto client = translate::TranslationServiceClient(

  auto const project = google::cloud::Project(argv[1]);
  auto const target = std::string{argc >= 3 ? argv[2] : "es-419"};
  auto response =
      client.TranslateText(project.FullName(), target, {std::string{kText}});
  if (!response) throw std::move(response).status();

  for (auto const& translation : response->translations()) {
    std::cout << translation.translated_text() << "\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 translate_v3::TranslationServiceClient. All RPCs are exposed as member functions of this class. Other classes provide helpers, configuration parameters, and infrastructure to mock translate_v3::TranslationServiceClient when testing your application.

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