This module provides a portable partial replacement of SWI-Prolog's user-defined arithmetic (evaluable) functions. It defines the compatibility directive arithmetic_function/1 and support for both runtime and compile-time evaluation of expressions that are a mixture between Prolog predicates used as functions and built-in evaluable terms.

 arithmetic_function(:NameArity) is det

Declare a predicate as an arithmetic function.

deprecated

- This function provides a partial work around for pure Prolog user-defined arithmetic functions that has been dropped in SWI-Prolog 5.11.23. Notably, it only deals with expression know at compile time.

 eval_clause(+Term, -Clause) is det[private]

Clause is a clause for evaluating the arithmetic expression Term.

 arithmetic_expression_value(:Expression, -Result) is det

True when Result unifies with the arithmetic result of evaluating Expression.

 evaluable(F) is semidet[private]

True if F and all its subterms are evaluable terms or variables.

 tidy(+GoalIn, -GoalOut)[private]

Cleanup the output from expand_function/3.