Struct TypeDescriptor 

pub struct TypeDescriptor {
    pub name: &'static str,
    pub summary: &'static str,
    pub docs: &'static str,
    pub clone: unsafe fn(ValuePayload) -> ValuePayload,
    pub drop: unsafe fn(ValuePayload),
    pub eq: unsafe fn(ValuePayload, ValuePayload) -> bool,
    pub fmt: unsafe fn(ValuePayload, &mut Formatter<'_>) -> Result<(), Error>,
    pub unshare: unsafe fn(&mut ValuePayload) -> *mut (),
}

Vtable for one type: lifecycle plus operations. All hooks are plain function pointers (never closures) so descriptors stay Copy and the global table hands them out by value. Every hook documents the payload domain it expects; calling one with a foreign payload is unsound, and every call site is a single choke point reviewed with the layout.

unshare is the copy-on-write gate: it rewrites the payload to a uniquely owned buffer when necessary and returns a mutable pointer the caller exclusively owns. Mutation must always go through Value::read_heap_mut; deriving &mut from a payload any other way is unsound for shared heaps.

Fields

name: &'static str

summary: &'static str

docs: &'static str

clone: unsafe fn(ValuePayload) -> ValuePayload

drop: unsafe fn(ValuePayload)

eq: unsafe fn(ValuePayload, ValuePayload) -> bool

fmt: unsafe fn(ValuePayload, &mut Formatter<'_>) -> Result<(), Error>

unshare: unsafe fn(&mut ValuePayload) -> *mut ()

Trait Implementations

impl Clone for TypeDescriptor

fn clone(&self) -> TypeDescriptor

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for TypeDescriptor