asio C++ library



Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at

Asio is a cross-platform C++ library for network and low-level I/O programming that provides developers with a consistent asynchronous model using a modern C++ approach.


An overview of the features included in Asio, plus rationale and design information.

Using, Building, and Configuring Asio

How to use Asio in your applications. Includes information on library dependencies and supported platforms.


A tutorial that introduces the fundamental concepts required to use Asio, and shows how to use Asio to develop simple client and server programs.


Examples that illustrate the use of Asio in more complex applications.


Detailed class and function reference.

Networking TS Compatibility

Description of changes to provide compatibility with the "C++ Extensions for Networking" Technical Specification.

Proposed Standard Executors

Description of Asio's support for the proposed standard executors library.

Revision History

Log of Asio changes made in each release.


Book-style text index of Asio documentation.