Did you know ...
Search Documentation:
Predicate clause/3
HOME
DOWNLOAD
SWI-Prolog
Sources/building
Docker images
Add-ons
Browse GIT
DOCUMENTATION
Manual
Packages
FAQ
Command line
PlDoc
Bluffers
▶
Prolog syntax
PceEmacs
HTML generation
License
Publications
Rev 7 Extensions
TUTORIALS
Beginner
▶
Getting started
Learn Prolog Now!
Simply Logical
Debugger
Development tools
Advanced
▶
Modules
Grammars (DCGs)
clp(fd)
Printing messages
PlDoc
Web applications
▶
Web applications
Let's Encrypt!
Pengines
Semantic web
▶
ClioPatria
RDF namespaces
Graphics
▶
XPCE
GUI options
Machine learning
▶
Probabilistic Logic Programming
External collections
▶
Meta level tutorials
For packagers
▶
Linux packages
COMMUNITY
IRC
Forum & mailing list
Blog
News
Report a bug
Submit a patch
Submit an add-on
Roadmap (on GitHub)
External links
Contributing
Code of Conduct
Contributors
SWI-Prolog items
COMMERCIAL
WIKI
Login
View changes
Sandbox
Wiki help
All tags
Documentation
Reference manual
Built-in Predicates
Examining the program
current_atom/1
current_blob/2
current_functor/2
current_flag/1
current_key/1
current_predicate/1
current_predicate/2
predicate_property/2
dwim_predicate/2
clause/2
clause/3
nth_clause/3
clause_property/2
Packages
Availability:
built-in
clause
(
:Head, ?Body, ?Reference
)
Equivalent to
clause/2
, but unifies
Reference
with a unique reference to the clause (see also
assert/2
,
erase/1
). If
Reference
is instantiated to a reference the clause's head and body will be unified with
Head
and
Body
.