Struct Viewtype 

pub struct Viewtype {
    pub name: String,
    pub c_type: String,
    pub nullable: bool,
    pub size_param: Option<String>,
}

An ATS2 viewtype representing a linear type wrapper around a C type.

In ATS2, viewtypes (also called linear types) combine a view (memory layout proof) with a type. A Viewtype describes the ATS2 type that wraps a C pointer to enforce ownership discipline at compile time.

For example, wrapping FILE* produces a viewtype like:

viewtypedef FILE_ptr = [l:addr] (FILE @ l | ptr l)

Fields

name: String

The ATS2 viewtype name (e.g., “FILE_vt”, “buffer_vt”).

c_type: String

The underlying C type being wrapped (e.g., “FILE*”, “char*”).

nullable: bool

Whether this viewtype is nullable (Option-like in ATS2). Nullable viewtypes generate additional null-check proof obligations.

size_param: Option<String>

Optional size constraint for buffer types. When set, generates dependent type annotations: {n:nat} buffer_vt(n).

Implementations

impl Viewtype

pub fn new(name: &str, c_type: &str) -> Self

Creates a new non-nullable viewtype wrapping the given C type.

pub fn nullable(name: &str, c_type: &str) -> Self

Creates a nullable viewtype (for functions that may return NULL).

pub fn sized(name: &str, c_type: &str, size_param: &str) -> Self

Creates a sized viewtype with a dependent type parameter.

pub fn to_ats2_definition(&self) -> String

Generates the ATS2 viewtype definition string.

Trait Implementations

impl Clone for Viewtype

fn clone(&self) -> Viewtype

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Viewtype

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Viewtype

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Hash for Viewtype

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 PartialEq for Viewtype

fn eq(&self, other: &Viewtype) -> 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 Serialize for Viewtype

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Eq for Viewtype

impl StructuralPartialEq for Viewtype