parameter/2

Description

parameter(Number, Term)

Used only in parametric objects, this method returns parameter values by using the parameter position in the entity identifier. See also this/1.

Template and modes

parameter(+integer, ?term)

Errors

Number is a variable:

instantiation_error

Number is neither a variable nor an integer value:

type_error(integer, Number)

Object identifier is not a compound term:

type_error(compound, Object)

Number is a negative integer value:

domain_error(not_less_than_zero, Number)

Examples

:- object(box(_Colour)).

    ...
    
    colour(Colour) :-
        parameter(1, Colour).

    ...

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Last updated on: July 4, 2000