Attribute Macro register_rule 

#[register_rule]

This procedural macro registers a decorated function with conjure_cp_rules’ global registry, and adds the rule to one or more RuleSet’s.

It may be used in any downstream crate. For more information on registration, see the inventory crate.

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Functions must have the signature fn(&Expr) -> ApplicationResult. The created rule will have the same name as the function.

Intermediary static variables are created to allow for the decentralized registry, with the prefix CONJURE_GEN_. Please ensure that other variable names in the same scope do not conflict with these.

This macro must decorate a function with the given signature. As arguments, it excepts a tuple of 2-tuples in the format: ((<RuleSet name>, <Priority in RuleSet>), ...)

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For example:

use conjure_cp_core::ast::Expression;
use conjure_cp_core::ast::SymbolTable;
use conjure_cp_core::rule_engine::{ApplicationError, ApplicationResult, RuleEffect};
use conjure_cp_core::rule_engine::register_rule;

#[register_rule("RuleSetName", 10)]
fn identity(expr: &Expression, symbols: &SymbolTable) -> ApplicationResult {
  Ok(RuleEffect::pure(expr.clone()))
}

Register a rule with the given rule sets and priorities.