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use super::Goal;
use crate::core::State;
#[derive(Debug)]
pub struct Both {
a: Box<dyn Goal>,
b: Box<dyn Goal>,
}
pub fn both(a: impl Goal, b: impl Goal) -> Both {
Both {
a: Box::new(a),
b: Box::new(b),
}
}
impl Goal for Both {
fn apply(&self, state: State) -> Option<State> {
self.a.apply(state).and_then(|s| self.b.apply(s))
}
}
#[cfg(test)]
mod test {
use crate::goals::{fail::Fail, succeed::Succeed};
use super::*;
#[test]
fn both_succeed() {
let state = State::new();
let goal = both(Succeed, Succeed);
let result = goal.apply(state);
assert!(result.is_some());
}
#[test]
fn both_succeed_then_fail() {
let state = State::new();
let goal = both(Succeed, Fail);
let result = goal.apply(state);
assert!(result.is_none());
}
#[test]
fn both_fail_then_succeed() {
let state = State::new();
let goal = both(Fail, Succeed);
let result = goal.apply(state);
assert!(result.is_none());
}
}