BAP Online Manuals : Library Reference : Library by Name : asserta
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6.2.9. asserta

adds a term to the front of the database

SYNOPSIS

asserta(Term)

SYNTAX

 asserta(Term) (i)

ARGUMENTS

void(Term) (i) Term to be added to the database.

DESCRIPTION

This is a standard prolog built-in. Asserta() adds Term to the beginning of the database. Term must should bound to an atom or a struct, but may contain free variables. The database entry is not removed upon backtracking. Database entries can only be removed by the use of the

retract () predicate.

EXAMPLE

asserta(hello),
asserta(world),
retract(X),
	write(X),nl,
	fail.

ERRORS

always succeeds. No runtime errors.

LAYERS

prolog-process, client-server, object

RELATED PREDICATES

assertz , retract ,

retractall , database , clause , listing

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BAP Online Manuals : Library Reference : Library by Name : asserta
Previous: append
Next: assertz