[/
 / Copyright (c) 2003-2025 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 /
 / Distributed under the Boost Software License, Version 1.0. (See accompanying
 / file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 /]

[section:files Files]

[note This feature requires I/O completion ports on Windows, and io_uring on
Linux (define `BOOST_ASIO_HAS_IO_URING` to enable).]

Boost.Asio provides support for manipulating stream-oriented and random-access files.
For example, to write to a newly created stream-oriented file:

  boost::asio::stream_file file(
      my_io_context, "/path/to/file",
      boost::asio::stream_file::write_only
        | boost::asio::stream_file::create
        | boost::asio::stream_file::truncate);

  file.async_write_some(my_buffer,
      [](error_code e, size_t n)
      {
        // ...
      });

or to read from a random-access file:

  boost::asio::random_access_file file(
      my_io_context, "/path/to/file",
      boost::asio::random_access_file::read_only);

  file.async_read_some_at(1234, my_buffer,
      [](error_code e, size_t n)
      {
        // ...
      });

[heading See Also]

[link boost_asio.reference.basic_file basic_file],
[link boost_asio.reference.basic_random_access_file basic_random_access_file],
[link boost_asio.reference.basic_stream_file basic_stream_file],
[link boost_asio.reference.file_base file_base],
[link boost_asio.reference.random_access_file random_access_file],
[link boost_asio.reference.stream_file stream_file].

[endsect]
