dmitry-saprykin / google-cloud-cpp

C++ Client Libraries for Google Cloud Services

Google Cloud Platform C++ Client Libraries

NOTICE: This repo will soon contain the code for all the other related google-cloud-cpp-* repos. As a new monorepo (#3612), the versioning of this repo will be changing to have a single per-repo version. See googleapis#3615 for more info.

This repository contains idiomatic C++ client libraries for the following Google Cloud Platform services.

• Google Cloud BigQuery (experimental)
• Google Cloud Bigtable
• Google Cloud Spanner (This currently lives in another repo, but is moving into this repo by June 2020).
• Google Cloud Pub/Sub (experimental)
• Google Cloud Storage

See each library's README.md file for more information about:

• Where to find the documentation for the library and the service.
• How to get started using the library.
• How to incorporate the library into your build system.
• The library's support status if not Generally Available (GA); unless noted in a library's README.md, these libraries are all GA and supported by Google.

NOTE: This repo and these libraries do not follow Semantic Versioning.

Supported Platforms

• Windows, macOS, Linux
• C++11 (and higher) compilers (we test with GCC >= 4.9, Clang >= 3.8, and MSVC >= 2019)
• Environments with or without exceptions
• Bazel and CMake builds

Quickstart

Each library (linked above) contains a directory named quickstart/ that's intended to help you get up and running in a matter of minutes. This quickstart/ directory contains a minimal "Hello World" program demonstrating how to use the library, along with minimal build files for common build systems, such as CMake and Bazel.

As an example, the following code snippet, taken from Google Cloud Storage, should give you a taste of what it's like to use one of these C++ libraries.

#include "google/cloud/storage/client.h"
#include <iostream>

int main(int argc, char* argv[]) {
  if (argc != 2) {
    std::cerr << "Missing bucket name.\n";
    std::cerr << "Usage: quickstart <bucket-name>\n";
    return 1;
  }
  std::string const bucket_name = argv[1];

  // Create aliases to make the code easier to read.
  namespace gcs = google::cloud::storage;

  // Create a client to communicate with Google Cloud Storage. This client
  // uses the default configuration for authentication and project id.
  google::cloud::StatusOr<gcs::Client> client =
      gcs::Client::CreateDefaultClient();
  if (!client) {
    std::cerr << "Failed to create Storage Client, status=" << client.status()
              << "\n";
    return 1;
  }

  auto writer = client->WriteObject(bucket_name, "quickstart.txt");
  writer << "Hello World!";
  writer.Close();
  if (writer.metadata()) {
    std::cout << "Successfully created object: " << *writer.metadata() << "\n";
  } else {
    std::cerr << "Error creating object: " << writer.metadata().status()
              << "\n";
    return 1;
  }

  auto reader = client->ReadObject(bucket_name, "quickstart.txt");
  std::string contents{std::istreambuf_iterator<char>{reader}, {}};
  std::cout << contents << "\n";

  return 0;
}

Contributing changes

See CONTRIBUTING.md for details on how to contribute to this project, including how to build and test your changes as well as how to properly format your code.

Licensing

Apache 2.0; see LICENSE for details.