context(Context)
Returns the execution context for a predicate clause using the term logtalk(Head,ExecutionContext) where Head is the head of the clause containing the call. This private predicate is mainly used for providing a default error context when type-checking predicate arguments. The ExecutionContext term should be regarded as an opaque term, which can be decoded using the logtalk::execution_context/7 predicate. Calls to this predicate are inlined at compilation time.
context(--callable)
type_error(var, Context)foo(A, N) :-
% type-check arguments
context(Context),
type::check(atom, A, Context),
type::check(integer, N, Context),
% arguments are fine; go ahead
... .