Trait gluon_check::unify::Unifier

pub trait Unifier<S, Type>
where
    Type: Unifiable<S>,
{
    // Required methods
    fn report_error(&mut self, error: Error<Type::Error, Type>);
    fn try_match_res(
        &mut self,
        l: &Type,
        r: &Type
    ) -> Result<Option<Type>, Error<Type::Error, Type>>;
    fn error_type(&self) -> Type;

    // Provided methods
    fn try_match(&mut self, l: &Type, r: &Type) -> Option<Type> { ... }
    fn allow_returned_type_replacement(&self) -> bool { ... }
}

A Unifier is a type which implements a unifying strategy between two values.

Required Methods

fn report_error(&mut self, error: Error<Type::Error, Type>)

Reports an error to the unifier for cases when returning the error is not possible.

fn try_match_res( &mut self, l: &Type, r: &Type ) -> Result<Option<Type>, Error<Type::Error, Type>>

fn error_type(&self) -> Type

Provided Methods

fn try_match(&mut self, l: &Type, r: &Type) -> Option<Type>

Attempt to unify l and r using the strategy of Self.

fn allow_returned_type_replacement(&self) -> bool

true if the returned type can be replaced by the caller

Implementors

impl<'a> Unifier<State<'a>, ArcType> for gluon_check::unify_type::UnifierState<'a, Instantiation<'_, '_>>

impl<'a, 'e> Unifier<State<'a>, ArcType> for gluon_check::unify_type::UnifierState<'a, Equal<'e>>

impl<'a, 'e> Unifier<State<'a>, ArcType> for gluon_check::unify_type::UnifierState<'a, Smaller>

impl<'a, 'e> Unifier<State<'a>, ArcType> for gluon_check::unify_type::UnifierState<'a, Subsume<'e>>

impl<'e, S, T> Unifier<S, T> for gluon_check::unify::UnifierState<S, Unify<'e, T, T::Error>>

where T: Unifiable<S> + PartialEq + Clone + Display + 'e, T::Variable: Clone, T::Factory: Clone,