Struct rustc::ty::TyS

pub struct TyS<'tcx> {
    pub sty: TypeVariants<'tcx>,
    pub flags: TypeFlags,
    // some fields omitted
}

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Fields

sty: TypeVariants<'tcx>

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flags: TypeFlags

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Methods

impl<'a, 'gcx, 'lcx, 'tcx> TyS<'tcx>

pub fn sort_string(&self, tcx: TyCtxt<'a, 'gcx, 'lcx>) -> String

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impl<'a, 'tcx> TyS<'tcx>

pub fn moves_by_default(
    &'tcx self,
    tcx: TyCtxt<'a, 'tcx, 'tcx>,
    param_env: ParamEnv<'tcx>,
    span: Span
) -> bool

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pub fn is_sized(
    &'tcx self,
    tcx: TyCtxt<'a, 'tcx, 'tcx>,
    param_env: ParamEnv<'tcx>,
    span: Span
) -> bool

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pub fn is_freeze(
    &'tcx self,
    tcx: TyCtxt<'a, 'tcx, 'tcx>,
    param_env: ParamEnv<'tcx>,
    span: Span
) -> bool

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pub fn needs_drop(
    &'tcx self,
    tcx: TyCtxt<'a, 'tcx, 'tcx>,
    param_env: ParamEnv<'tcx>
) -> bool

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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.)

pub fn is_representable(
    &'tcx self,
    tcx: TyCtxt<'a, 'tcx, 'tcx>,
    sp: Span
) -> Representability

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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>

Type utilities

pub fn is_nil(&self) -> bool

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pub fn is_never(&self) -> bool

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pub fn is_defaulted_unit(&self) -> bool

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Test whether this is a () which was produced by defaulting a diverging type variable with feature(never_type) disabled.

pub fn is_primitive(&self) -> bool

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pub fn is_ty_var(&self) -> bool

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pub fn is_phantom_data(&self) -> bool

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pub fn is_bool(&self) -> bool

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pub fn is_param(&self, index: u32) -> bool

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pub fn is_self(&self) -> bool

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pub fn is_slice(&self) -> bool

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pub fn is_simd(&self) -> bool

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pub fn sequence_element_type(&self, tcx: TyCtxt<'a, 'gcx, 'tcx>) -> Ty<'tcx>

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pub fn simd_type(&self, tcx: TyCtxt<'a, 'gcx, 'tcx>) -> Ty<'tcx>

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pub fn simd_size(&self, _cx: TyCtxt) -> usize

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pub fn is_region_ptr(&self) -> bool

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pub fn is_mutable_pointer(&self) -> bool

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pub fn is_unsafe_ptr(&self) -> bool

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pub fn is_box(&self) -> bool

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pub fn boxed_ty(&self) -> Ty<'tcx>

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

pub fn is_scalar(&self) -> bool

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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.)

pub fn is_floating_point(&self) -> bool

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

pub fn is_trait(&self) -> bool

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pub fn is_enum(&self) -> bool

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pub fn is_closure(&self) -> bool

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pub fn is_generator(&self) -> bool

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pub fn is_integral(&self) -> bool

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pub fn is_fresh_ty(&self) -> bool

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pub fn is_fresh(&self) -> bool

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pub fn is_uint(&self) -> bool

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pub fn is_char(&self) -> bool

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pub fn is_fp(&self) -> bool

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pub fn is_numeric(&self) -> bool

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pub fn is_signed(&self) -> bool

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pub fn is_machine(&self) -> bool

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pub fn has_concrete_skeleton(&self) -> bool

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pub fn builtin_deref(
    &self,
    explicit: bool,
    pref: LvaluePreference
) -> Option<TypeAndMut<'tcx>>

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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.

pub fn builtin_index(&self) -> Option<Ty<'tcx>>

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Returns the type of ty[i]

pub fn fn_sig(&self, tcx: TyCtxt<'a, 'gcx, 'tcx>) -> PolyFnSig<'tcx>

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pub fn is_fn(&self) -> bool

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pub fn ty_to_def_id(&self) -> Option<DefId>

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pub fn ty_adt_def(&self) -> Option<&'tcx AdtDef>

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Important traits for Vec<u8>

impl Write for Vec<u8>

pub fn regions(&self) -> Vec<Region<'tcx>>

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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.

pub fn to_opt_closure_kind(&self) -> Option<ClosureKind>

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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>

pub fn is_primitive_ty(&self) -> bool

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pub fn is_suggestable(&self) -> bool

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impl<'tcx> TyS<'tcx>

Important traits for TypeWalker<'tcx>

impl<'tcx> Iterator for TypeWalker<'tcx> type Item = Ty<'tcx>;

pub fn walk(&'tcx self) -> 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>

impl<A> Iterator for IntoIter<A> where
    A: Array,  type Item = <A as Array>::Element;

pub fn walk_shallow(&'tcx self) -> AccIntoIter<TypeWalkerArray<'tcx>>

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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).

pub fn maybe_walk<F>(&'tcx self, f: F) where
    F: FnMut(Ty<'tcx>) -> bool, 

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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> PartialEq for TyS<'tcx>

fn eq(&self, other: &TyS<'tcx>) -> bool

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

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

This method tests for !=.

impl<'tcx> Eq for TyS<'tcx>

impl<'tcx> Hash for TyS<'tcx>

fn hash<H: Hasher>(&self, s: &mut H)

Feeds this value into the given [Hasher].

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

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

impl<'gcx> HashStable<StableHashingContext<'gcx>> for TyS<'gcx>

fn hash_stable<W: StableHasherResult>(
    &self,
    hcx: &mut StableHashingContext<'gcx>,
    hasher: &mut StableHasher<W>
)

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impl<'tcx> Print for TyS<'tcx>

fn print<F: Write>(&self, f: &mut F, cx: &mut PrintContext) -> Result

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fn print_to_string(&self, cx: &mut PrintContext) -> String

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fn print_display<F: Write>(&self, f: &mut F, cx: &mut PrintContext) -> Result

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fn print_display_to_string(&self, cx: &mut PrintContext) -> String

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fn print_debug<F: Write>(&self, f: &mut F, cx: &mut PrintContext) -> Result

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fn print_debug_to_string(&self, cx: &mut PrintContext) -> String

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impl<'tcx> Display for TyS<'tcx>

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

Formats the value using the given formatter.

impl<'tcx> Debug for TyS<'tcx>

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

Formats the value using the given formatter.