To preverse compatibility with other Prolog systems not the
name 'user_output' is returned, but 'user'. This predicate is not defined in the ISO
Prolog standard.This built-in predicate identifies the name of the current output stream. The name of the current output stream is unified with the value of the parameter Name. If the current output stream is connected to a file then the name of the file is returned, if the standard output stream is the current output stream then the value 'user' is unified with the Name parameter.
| To preverse compatibility with other Prolog systems not the
name 'user_output' is returned, but 'user'. This predicate is not defined in the ISO
Prolog standard. |
see also: at_end_of_stream/0 at_end_of_stream/1 close/1 close/2 close_user_streams/0 current_output/1 flush_output/0 flush_output/1 open/3 open/4 prolog I/O set_input/1 set_output/1 set_stream_position/2 stream_property/2
| Example | |
| telling(Name). | Name is unified with the term 'user', which is the name of the standard output stream |
| tell('c:\\temp\\test.txt'), telling(Name), told. |
the file 'c:\\temp\\test.txt' is opened (or created) and made the current output stream then telling/1 is used to retrieve the name of the current output stream, the value of Name after telling/1 is 'c:\\temp\\test.txt', the stream is then closed. |