Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

This is the documentation for a snapshot of the develop branch, built from commit 029fa0d959.
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Files

[Note] 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)
    {
      // ...
    });
See Also

basic_file, basic_random_access_file, basic_stream_file, file_base, random_access_file, stream_file.


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