Struct rustc::ty::TyS[][src]

pub struct TyS<'tcx> {
    pub sty: TypeVariants<'tcx>,
    pub flags: TypeFlags,
    outer_exclusive_binder: DebruijnIndex,
}
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Fields

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This is a kind of confusing thing: it stores the smallest binder such that

(a) the binder itself captures nothing but (b) all the late-bound things within the type are captured by some sub-binder.

So, for a type without any late-bound things, like u32, this will be INNERMOST, because that is the innermost binder that captures nothing. But for a type &'D u32, where 'D is a late-bound region with debruijn index D, this would be D+1 -- the binder itself does not capture D, but D is captured by an inner binder.

We call this concept an "exclusive" binder D (because all debruijn indices within the type are contained within 0..D (exclusive)).

Methods

impl<'a, 'gcx, 'lcx, 'tcx> TyS<'tcx>
[src]

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impl<'a, 'gcx, 'tcx> TyS<'tcx>
[src]

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Calculate the forest of DefIds from which this type is visibly uninhabited.

impl<'a, 'tcx> TyS<'tcx>
[src]

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If ty.needs_drop(...) returns true, then ty is definitely non-copy and might have a destructor attached; if it returns false, then ty definitely has no destructor (i.e. no drop glue).

(Note that this implies that if ty has a destructor attached, then needs_drop will definitely return true for ty.)

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Check whether a type is representable. This means it cannot contain unboxed structural recursion. This check is needed for structs and enums.

impl<'a, 'gcx, 'tcx> TyS<'tcx>
[src]

Type utilities

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panics if called on any type other than Box<T>

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A scalar type is one that denotes an atomic datum, with no sub-components. (A TyRawPtr is scalar because it represents a non-managed pointer, so its contents are abstract to rustc.)

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Returns true if this type is a floating point type and false otherwise.

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Returns the type and mutability of *ty.

The parameter explicit indicates if this is an explicit dereference. Some types---notably unsafe ptrs---can only be dereferenced explicitly.

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Returns the type of ty[i].

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Important traits for Vec<u8>

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Returns the regions directly referenced from this type (but not types reachable from this type via walk_tys). This ignores late-bound regions binders.

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When we create a closure, we record its kind (i.e., what trait it implements) into its ClosureSubsts using a type parameter. This is kind of a phantom type, except that the most convenient thing for us to are the integral types. This function converts such a special type into the closure kind. To go the other way, use tcx.closure_kind_ty(closure_kind).

Note that during type checking, we use an inference variable to represent the closure kind, because it has not yet been inferred. Once upvar inference (in src/librustc_typeck/check/upvar.rs) is complete, that type variable will be unified.

impl<'tcx> TyS<'tcx>
[src]

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impl<'tcx> TyS<'tcx>
[src]

Important traits for TypeWalker<'tcx>

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Iterator that walks self and any types reachable from self, in depth-first order. Note that just walks the types that appear in self, it does not descend into the fields of structs or variants. For example:

isize => { isize }
Foo<Bar<isize>> => { Foo<Bar<isize>>, Bar<isize>, isize }
[isize] => { [isize], isize }

Important traits for IntoIter<A>

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Iterator that walks the immediate children of self. Hence Foo<Bar<i32>, u32> yields the sequence [Bar<i32>, u32] (but not i32, like walk).

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Walks ty and any types appearing within ty, invoking the callback f on each type. If the callback returns false, then the children of the current type are ignored.

Note: prefer ty.walk() where possible.

Trait Implementations

impl<'tcx> Ord for TyS<'tcx>
[src]

This method returns an Ordering between self and other. Read more

Compares and returns the maximum of two values. Read more

Compares and returns the minimum of two values. Read more

impl<'tcx> PartialOrd for TyS<'tcx>
[src]

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

This method tests less than (for self and other) and is used by the < operator. Read more

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more

This method tests greater than (for self and other) and is used by the > operator. Read more

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more

impl<'tcx> PartialEq for TyS<'tcx>
[src]

This method tests for self and other values to be equal, and is used by ==. Read more

This method tests for !=.

impl<'tcx> Eq for TyS<'tcx>
[src]

impl<'tcx> Hash for TyS<'tcx>
[src]

Feeds this value into the given [Hasher]. Read more

Feeds a slice of this type into the given [Hasher]. Read more

impl<'a, 'gcx> HashStable<StableHashingContext<'a>> for TyS<'gcx>
[src]

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impl<'tcx> Print for TyS<'tcx>
[src]

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impl<'tcx> Display for TyS<'tcx>
[src]

Formats the value using the given formatter. Read more

impl<'tcx> Debug for TyS<'tcx>
[src]

Formats the value using the given formatter. Read more

Auto Trait Implementations

impl<'tcx> !Send for TyS<'tcx>

impl<'tcx> !Sync for TyS<'tcx>