This directory contains an idiomatic C++ client library for interacting with Cloud Pub/Sub, an asynchronous messaging service that decouples services that produce events from services that process events.
While this library is GA, please note that the Google Cloud C++ client libraries do not follow Semantic Versioning.
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/pubsub/publisher.h"
#include <iostream>
int main(int argc, char* argv[]) try {
if (argc != 3) {
std::cerr << "Usage: " << argv[0] << " <project-id> <topic-id>\n";
return 1;
}
std::string const project_id = argv[1];
std::string const topic_id = argv[2];
// Create a namespace alias to make the code easier to read.
namespace pubsub = ::google::cloud::pubsub;
auto publisher = pubsub::Publisher(
pubsub::MakePublisherConnection(pubsub::Topic(project_id, topic_id)));
auto id =
publisher
.Publish(pubsub::MessageBuilder{}.SetData("Hello World!").Build())
.get();
if (!id) throw std::move(id).status();
std::cout << "Hello World published with id=" << *id << "\n";
return 0;
} catch (google::cloud::Status const& status) {
std::cerr << "google::cloud::Status thrown: " << status << "\n";
return 1;
}
.h files