Hi - > Yes, lets make =CMD optional. But why assume "cat"? Can't you then > simply use fopen instaed of popen in the code to get the FILE* to pass > to archive_read_open_FILE? Or even just open and archive_read_open_fd?
One reason: the defer_dtor<>-based auto-closing of these objects is different. (popens must be closed with pclose not something else.) A robust auto-closer is needed because of all the exceptions we may trigger. - FChE
