meta_non_terminal(MetaNonTerminalTemplate) meta_non_terminal((MetaNonTerminalTemplate1, MetaNonTerminalTemplate2, ...)) meta_non_terminal([MetaNonTerminalTemplate1, MetaNonTerminalTemplate2, ...]) meta_non_terminal(Entity::MetaNonTerminalTemplate) meta_non_terminal((Entity1::MetaNonTerminalTemplate1, Entity2::MetaNonTerminalTemplate2, ...)) meta_non_terminal([Entity1::MetaNonTerminalTemplate1, Entity2::MetaNonTerminalTemplate2, ...])
Declares meta-non-terminals, i.e., non-terminals that have arguments that will be called as goals. An argument may also be a closure instead of a goal if the non-terminal uses the call//1-N
Logtalk built-in methods to construct and call the actual goal from the closure and the additional arguments.
Meta-arguments which are goals are represented by the integer 0
. Meta-arguments which are closures are represented by a positive integer, N
, representing the number of additional arguments that will be appended to the closure in order to construct the corresponding meta-call. Normal arguments are represented by the atom *
. Meta-arguments are always called in the context of the sender, i.e. in the meta-non-terminal calling context, not in the meta-non-terminal definition context.
meta_non_terminal(+meta_non_terminal_template_term) meta_non_terminal(+object_identifier::+meta_non_terminal_template_term) meta_non_terminal(+category_identifier::+meta_non_terminal_template_term)
:- meta_non_terminal(findall(*, 0, *)). :- meta_non_terminal(forall(0, 0)). :- meta_non_terminal(maplist(2, *, *)).