Trait rustc::middle::ty_relate::TypeRelationUnstable
[-] [+]
[src]
pub trait TypeRelation<'a, 'tcx>: Sized {
fn tcx(&self) -> &'a ctxt<'tcx>;
fn tag(&self) -> &'static str;
fn a_is_expected(&self) -> bool;
fn relate_with_variance<T: Relate<'a, 'tcx>>(&mut self, variance: Variance, a: &T, b: &T) -> RelateResult<'tcx, T>;
fn tys(&mut self, a: Ty<'tcx>, b: Ty<'tcx>) -> RelateResult<'tcx, Ty<'tcx>>;
fn regions(&mut self, a: Region, b: Region) -> RelateResult<'tcx, Region>;
fn binders<T>(&mut self, a: &Binder<T>, b: &Binder<T>) -> RelateResult<'tcx, Binder<T>> where T: Relate<'a, 'tcx>;
fn relate<T: Relate<'a, 'tcx>>(&mut self, a: &T, b: &T) -> RelateResult<'tcx, T> { ... }
}
Required Methods
fn tcx(&self) -> &'a ctxt<'tcx>
fn tag(&self) -> &'static str
Returns a static string we can use for printouts.
fn a_is_expected(&self) -> bool
Returns true if the value a
is the "expected" type in the
relation. Just affects error messages.
fn relate_with_variance<T: Relate<'a, 'tcx>>(&mut self, variance: Variance, a: &T, b: &T) -> RelateResult<'tcx, T>
Switch variance for the purpose of relating a
and b
.
fn tys(&mut self, a: Ty<'tcx>, b: Ty<'tcx>) -> RelateResult<'tcx, Ty<'tcx>>
fn regions(&mut self, a: Region, b: Region) -> RelateResult<'tcx, Region>
fn binders<T>(&mut self, a: &Binder<T>, b: &Binder<T>) -> RelateResult<'tcx, Binder<T>> where T: Relate<'a, 'tcx>
Provided Methods
fn relate<T: Relate<'a, 'tcx>>(&mut self, a: &T, b: &T) -> RelateResult<'tcx, T>
Generic relation routine suitable for most anything.
Implementors
impl<'a, 'tcx> TypeRelation<'a, 'tcx> for Bivariate<'a, 'tcx>
impl<'a, 'tcx> TypeRelation<'a, 'tcx> for Equate<'a, 'tcx>
impl<'a, 'tcx> TypeRelation<'a, 'tcx> for Glb<'a, 'tcx>
impl<'a, 'tcx> TypeRelation<'a, 'tcx> for Lub<'a, 'tcx>
impl<'a, 'tcx> TypeRelation<'a, 'tcx> for Sub<'a, 'tcx>
impl<'a, 'tcx> TypeRelation<'a, 'tcx> for Match<'a, 'tcx>