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meta_predicate_pattern(?Pattern)

Describes built-in ECLiPSe meta-predicate patterns
Pattern
Prolog term describing the meta-predicate pattern

Description

This predicate returns a structure, Pattern, that describes the control flow through the arguments of a meta-predicate.

The functor and arity of Pattern correspond to the functor and arity of the meta-predicate. The arguments are each populated with one of the following atomic descriptors:

u
A goal that is unconditionally called whenever the predicate is called.
e
A goal whose exit leads unconditionally to the predicate exit.
s
A goal whose behaviour is the combination of u and e.
:
A goal that is called directly.
0
A goal that is not directly called, but is further processed.

An integer

A goal that is constructed by appending the number of specified arguments.

c
A clause.
p
A PredSpec.
*
An argument that is not one of the above.

Fail Conditions

no

Resatisfiable

yes

See Also

instrument : instrument / 2, instrument : instrument / 3, library(instrument), instrument : struct(itemplate)