What are some examples of using Boost.Asio in C++?

What are some examples of using Boost.Asio in C++?

Boost.Asio is a cross-platform C++ library for network and low-level I/O programming. Here are a few examples:

1. Asynchronous TCP Server: Create a server that handles multiple client connections asynchronously.
2. HTTP Client: Implement a simple HTTP client that fetches web pages using asynchronous requests.
3. Serial Port Communication: Use Boost.Asio to read from and write to serial ports for device communication.

Can you show me a code snippet for an asynchronous TCP server?

Sure! Here's a basic example of an asynchronous TCP server using Boost.Asio:

#include <boost/asio.hpp>
#include <iostream>

using boost::asio::ip::tcp;

class Server {
public:
    Server(boost::asio::io_context& io_context) : acceptor_(io_context, tcp::endpoint(tcp::v4(), 12345)) {
        start_accept();
    }

private:
    void start_accept() {
        tcp::socket socket(acceptor_.get_executor().context());
        acceptor_.async_accept(socket, [this](boost::system::error_code ec) {
            if (!ec) {
                std::cout << "Client connected!" << std::endl;
            }
            start_accept();
        });
    }

    tcp::acceptor acceptor_;
};

int main() {
    boost::asio::io_context io_context;
    Server server(io_context);
    io_context.run();
    return 0;
}

This code sets up a TCP server that listens on port 12345 and accepts incoming connections asynchronously.

What about error handling in Boost.Asio?

Error handling in Boost.Asio is typically done using the boost::system::error_code parameter in asynchronous operations. You can check if an operation succeeded by examining this error code. For example:

if (ec) {
    std::cerr << "Error: " << ec.message() << std::endl;
}

This allows you to handle different types of errors gracefully.