Struct VisitorState 

struct VisitorState {
    root_use_flags: RootUseFlags,
    outer_ty_kind: OuterTyKind,
}

Fields

root_use_flags: RootUseFlags

Flags describing both the overall context in which the current Ty is, linked to how the Visitor’s original Ty was used.

outer_ty_kind: OuterTyKind

Flags describing both the immediate context in which the current Ty is, linked to how it relates to its parent Ty (or lack thereof).

Implementations

impl VisitorState

fn next(&self, current_ty: Ty<'_>) -> Self

From an existing state, compute the state of any subtype of the current type. (General case. For the case where the current type is a function pointer, see next_in_fnptr.)

fn next_in_fnptr(&self, current_ty: Ty<'_>, fn_pos: FnPos) -> Self

From an existing state, compute the state of any subtype of the current type. (Case where the current type is a function pointer, meaning we need to specify if the subtype is an argument or the return.)

fn fn_entry_point(fn_mode: CItemKind, fn_pos: FnPos) -> Self

Get the proper visitor state for a given function’s arguments or return type.

fn static_entry_point() -> Self

Get the proper visitor state for a static variable’s type

fn is_in_function(&self) -> bool

Whether the type is used in a function.

fn is_in_function_return(&self) -> bool

Whether the type is used (directly or not) in a function, in return position.

fn is_in_defined_function(&self) -> bool

Whether the type is used (directly or not) in a defined function. In other words, whether or not we allow non-FFI-safe types behind a C pointer, to be treated as an opaque type on the other side of the FFI boundary.

fn is_in_fnptr(&self) -> bool

Whether the type is used (directly or not) in a function pointer type. Here, we also allow non-FFI-safe types behind a C pointer, to be treated as an opaque type on the other side of the FFI boundary.

fn can_expect_ty_params(&self) -> bool

Whether we can expect type parameters and co in a given type.

Trait Implementations

impl Clone for VisitorState

fn clone(&self) -> VisitorState

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for VisitorState

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

Formats the value using the given formatter.

impl PartialEq for VisitorState

fn eq(&self, other: &VisitorState) -> 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 Copy for VisitorState

impl Eq for VisitorState

impl StructuralPartialEq for VisitorState

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 2 bytes