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Make Evaluable trait

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greg 2016-01-19 01:30:48 -08:00
parent 16e8d969be
commit 5a9ebb188d
1 changed files with 6 additions and 0 deletions
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6
src/eval.rs
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@ -17,6 +17,12 @@ impl Evaluator {
} }
} }
trait Evaluable {
type Output;
fn is_reducible(&self) -> bool;
fn reduce(self) -> Self::Output;
}
impl Evaluator { impl Evaluator {
fn reduce_node(&mut self, mut node: ASTNode) -> String { fn reduce_node(&mut self, mut node: ASTNode) -> String {
loop { loop {