Struct Binder 

pub struct Binder<'db, T: BoundTerm<'db>> {
    pub variables: Vec<SymVariable<'db>>,
    pub bound_value: T,
}

Indicates a binder for generic variables

Fields

variables: Vec<SymVariable<'db>>

bound_value: T

Implementations

impl<'db, T: BoundTerm<'db>> Binder<'db, T>

pub fn len(&self) -> usize

pub fn is_empty(&self) -> bool

pub fn kind(&self, db: &'db dyn Db, index: usize) -> SymGenericKind

pub fn open( &self, db: &'db dyn Db, func: impl FnMut(usize) -> T::GenericTerm, ) -> T::Output

where T: Subst<'db>,

Generic way to “open” a binder, giving a function that computes the replacement value for each bound variable. You may preference Self::substitute for the most common cases.

Parameters

• db, the database
• func, compute the replacement for bound variable at the given index

pub fn substitute( &self, db: &'db dyn Db, substitution: &[impl Into<T::GenericTerm> + Copy], ) -> T::Output

Open the binder by replacing each variable with the corresponding term from substitution.

Panics

If substitution does not have the correct length or there is a kind-mismatch.

pub fn map<U>(self, _db: &'db dyn Db, op: impl FnOnce(T) -> U) -> Binder<'db, U>

where U: BoundTerm<'db>,

Maps the bound contents to something else using the contents of argument term arg.

arg will automatically have any bound variables shifted by 1 to account for having been inserted into a new binder.

If no arg is needed just supply ().

NB. The argument is a fn to prevent accidentally leaking context.

pub fn map_ref<U>( &self, _db: &'db dyn Db, op: impl FnOnce(&T) -> U, ) -> Binder<'db, U>

where U: BoundTerm<'db>,

Maps the bound contents to something else using the contents of argument term arg.

arg will automatically have any bound variables shifted by 1 to account for having been inserted into a new binder.

If no arg is needed just supply ().

NB. The argument is a fn to prevent accidentally leaking context.

Trait Implementations

impl<'db, T> BoundTerm<'db> for Binder<'db, T>

where T: BoundTerm<'db>,

const BINDER_LEVELS: usize

type BoundTerm = T

type LeafTerm = <T as BoundTerm<'db>>::LeafTerm

fn bind( db: &'db dyn Db, symbols_to_bind: &mut dyn Iterator<Item = Vec<SymVariable<'db>>>, leaf_value: T::LeafTerm, ) -> Self

fn as_binder(&self) -> Result<&Binder<'db, T>, &Self::LeafTerm>

impl<'db, T: Clone + BoundTerm<'db>> Clone for Binder<'db, T>

fn clone(&self) -> Binder<'db, T>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'db, T: Debug + BoundTerm<'db>> Debug for Binder<'db, T>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'db, T: Hash + BoundTerm<'db>> Hash for Binder<'db, T>

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<'db, T> Index<usize> for Binder<'db, T>

where T: BoundTerm<'db>,

type Output = SymVariable<'db>

The returned type after indexing.

fn index(&self, index: usize) -> &Self::Output

Performs the indexing (container[index]) operation.

impl<'db, T: Ord + BoundTerm<'db>> Ord for Binder<'db, T>

fn cmp(&self, other: &Binder<'db, T>) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl<'db, T: PartialEq + BoundTerm<'db>> PartialEq for Binder<'db, T>

fn eq(&self, other: &Binder<'db, T>) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<'db, T: PartialOrd + BoundTerm<'db>> PartialOrd for Binder<'db, T>

fn partial_cmp(&self, other: &Binder<'db, T>) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl<'db, T> Serialize for Binder<'db, T>

where T: Serialize + BoundTerm<'db>,

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl<'db, T: BoundTerm<'db>> Subst<'db> for Binder<'db, T>

where T::Output: BoundTerm<'db>,

type GenericTerm = <T as Subst<'db>>::GenericTerm

The notion of generic term appropriate for this type. When we substitute variables, this is the type of value that we replace them with.

fn subst_vars( &self, db: &'db dyn Db, map: &Map<SymVariable<'db>, Self::GenericTerm>, ) -> Self::Output

Returns a version of self where universal free variables have been replaced by the corresponding entry in terms. If a variable is not present in terms it is not substituted.

fn subst_var( &self, db: &'db dyn Db, var: SymVariable<'db>, term: Self::GenericTerm, ) -> Self::Output

Replace the variable var with term.

fn resolve_infer_var( &self, db: &'db dyn Db, bound_vars: &mut Vec<SymVariable<'db>>, op: impl FnMut(InferVarIndex) -> Option<Self::GenericTerm>, ) -> Self::Output

Replace all inference variables with whatever is returned by op; if op returns None, the inference variable is left unchanged.

impl<'db, T: BoundTerm<'db>> SubstWith<'db, <T as Subst<'db>>::GenericTerm> for Binder<'db, T>

type Output = Binder<'db, T>

The type of the resulting term; typically Self but not always.

fn identity(&self) -> Self::Output

Reproduce self with no edits.

fn subst_with<'subst>( &'subst self, db: &'db dyn Db, bound_vars: &mut Vec<SymVariable<'db>>, subst_fns: &mut SubstitutionFns<'_, 'db, T::GenericTerm>, ) -> Self::Output

Replace self applying the changes from subst_fns.

impl<'db, T: BoundTerm<'db>> Update for Binder<'db, T>

unsafe fn maybe_update(old_pointer_: *mut Self, new_value_: Self) -> bool

Returns

impl<'db, T: Eq + BoundTerm<'db>> Eq for Binder<'db, T>

impl<'db, T: BoundTerm<'db>> StructuralPartialEq for Binder<'db, T>