minerva 0.2.0

Causal ordering for distributed systems
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#![allow(
    clippy::unused_self,
    clippy::needless_borrow,
    reason = "the receiver shape is the autoref specialization probe"
)]

use crate::metis::{Cut, VersionVector};
use core::marker::PhantomData;

struct Probe<T>(PhantomData<T>);

impl<T: Default> Probe<T> {
    fn has_default(&self) -> bool {
        true
    }
}

impl<T: From<VersionVector>> Probe<T> {
    fn has_from(&self) -> bool {
        true
    }
}

trait FallbackDefault {
    fn has_default(&self) -> bool {
        false
    }
}

impl<T> FallbackDefault for &Probe<T> {}

trait FallbackFrom {
    fn has_from(&self) -> bool {
        false
    }
}

impl<T> FallbackFrom for &Probe<T> {}

#[test]
fn cut_has_no_default() {
    assert!(!(&Probe::<Cut>(PhantomData)).has_default());
    assert!((&Probe::<VersionVector>(PhantomData)).has_default());
}

#[test]
fn cut_has_no_vector_from() {
    assert!(!(&Probe::<Cut>(PhantomData)).has_from());
    assert!((&Probe::<VersionVector>(PhantomData)).has_from());
}