public static async File new_tmp_async (string? tmpl, int io_priority = DEFAULT, Cancellable? cancellable = null, out FileIOStream iostream) throws Error
tmpl should be a string in the GLib file name encoding containing a sequence of six 'X' characters, and containing no directory
components. If it is null, a default template is used.
Template for the file name, as in open_tmp, or null for a default template
the I/O priority of the request
optional Cancellable object, null to ignore
a TaskReadyCallback to call when the request is done
data to pass to