create_logtalk_flag(Flag, Value, Options)
Creates a new Logtalk flag and sets its default value. User-defined flags can be queried and set in the same way as pre-defined flags by using, respectively, the current_logtalk_flag/2 and set_logtalk_flag/2 built-in predicates.
This predicate is based on the specification of the SWI-Prolog create_prolog_flag/3 built-in predicate and supports the same options: access(Access), where Access can be either read_write (the default) or read_only; keep(Keep), where Keep can be either false (the default) or true, for deciding if an existing definition of the flag should be kept or replaced by the new one; and type(Type) for specifying the type of the flag, which can be boolean, atom, integer, float, or term (which only restricts the flag value to ground terms). When the type/1 option is not specified, the type of the flag is inferred from its initial value.
create_logtalk_flag(+atom, +ground, +list(ground))
instantiation_errorinstantiation_errorinstantiation_errortype_error(atom, Flag)type_error(atom, Flag)domain_error(flag_value, Flag + Value)permission_error(modify, flag, Flag)| ?- create_logtalk_flag(pretty_print_blobs, false, []).