16 lines
943 B
Markdown
16 lines
943 B
Markdown
|
@defgroup builtins YAP Core Built-ins
|
||
|
|
|
||
|
|
@brief This chapter describes the core built-in predicates that control the execution of
|
||
|
|
Prolog programs, provide fundamental functionality such as termm manipulation or arithmetic, and support interaction with external
|
||
|
|
resources,
|
||
|
|
|
||
|
|
Many of the predicates described here have been standardised by the International Standard Organization.
|
||
|
|
The corresponding standartised subset of Prolog also known as ISO-Prolog.
|
||
|
|
In the description of the arguments of predicates the following
|
||
|
|
notation will be used:
|
||
|
|
|
||
|
|
+ a preceding plus sign will denote an argument as an "input
|
||
|
|
argument" - the argument is read, not written, and it cannot be a free variable at the time of the call;
|
||
|
|
+ a preceding minus sign will denote an "output argument";
|
||
|
|
+ an argument with no preceding symbol can be used in both ways.
|