[−][src]Trait chalk_engine::context::AnswerStream

pub trait AnswerStream<C: Context> {
    fn peek_answer(
        &mut self, 
        should_continue: impl Fn() -> bool
    ) -> AnswerResult<C>;
    fn next_answer(
        &mut self, 
        should_continue: impl Fn() -> bool
    ) -> AnswerResult<C>;
    fn any_future_answer(
        &self, 
        test: impl Fn(&C::InferenceNormalizedSubst) -> bool
    ) -> bool;
}

Required methods

`fn peek_answer(&mut self, should_continue: impl Fn() -> bool) -> AnswerResult<C>`

Gets the next answer for a given goal, but doesn't increment the answer index. Calling this or next_answer again will give the same answer.

`fn next_answer(&mut self, should_continue: impl Fn() -> bool) -> AnswerResult<C>`

Gets the next answer for a given goal, incrementing the answer index. Calling this or peek_answer again will give the next answer.

`fn any_future_answer( &self, test: impl Fn(&C::InferenceNormalizedSubst) -> bool ) -> bool`

Invokes test with each possible future answer, returning true immediately if we find any answer for which test returns true.

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Implementors