posix_file::open

Open a file.

void
open(
    file_mode mode,
    path_type const& path,
    error_code& ec);

The file must not already be open.

Name	Description
`mode`	The open mode, which must be a valid \|9\|file_mode.
`path`	The path of the file to open.
`ec`	Set to the error, if any occurred.