A.36.3.2 Reflective access to options
AllApplicationManualNameSummaryHelp

  • Documentation
    • Reference manual
      • The SWI-Prolog library
        • library(predicate_options): Declare option-processing of predicates
          • Improving on the current situation
            • Reflective access to options
              • predicate_options/3
              • assert_predicate_options/4
              • current_predicate_option/3
              • check_predicate_option/3
              • current_option_arg/2
              • current_predicate_options/3
              • check_predicate_options/0
              • derive_predicate_options/0
              • retractall_predicate_options/0
              • derived_predicate_options/3
              • derived_predicate_options/1
    • Packages
Availability::- use_module(library(predicate_options)).(can be autoloaded)
Source[det]check_predicate_option(:PI, +Arg, +Option)
Verify predicate options at runtime. Similar to current_predicate_option/3, but intended to support runtime checking.
Errors
- existence_error(option, OptionName) if the option is not supported by PI.
- type_error(Type, Value) if the option is supported but the value does not match the option type. See must_be/2.