Construct and open a basic_file
.
basic_file( const executor_type & ex, const std::string & path, file_base::flags open_flags);
This constructor initialises a file and opens it.
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.