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Open the file using the specified path.
void open(
    const char * path,
    file_base::flags open_flags,
    boost::system::error_code & ec);
This function opens the file so that it will use the specified path.
The path name identifying the file to be opened.
A set of flags that determine how the file should be opened.
Set to indicate what error occurred, if any.
boost::asio::stream_file file(my_context);
boost::system::error_code ec;
file.open("/path/to/my/file", boost::asio::stream_file::read_only, ec);
if (ec)
{
  // An error occurred.
}