Construct and open a
basic_random_access_file( const executor_type & ex, const char * path, file_base::flags open_flags);
This constructor initialises and opens a file.
The I/O executor that the file will use, by default, to dispatch handlers for any asynchronous operations performed on the file.
The path name identifying the file to be opened.
A set of flags that determine how the file should be opened.
Thrown on failure.