Struct mx_erased 

#[repr(C)]
pub struct mx_erased {
    pub base: *const mx_base_vtable,
}

Type-erased object header.

This is the common prefix of all erased objects, providing access to the base vtable. The actual data follows this header in memory.

Memory Layout

┌─────────────────────────────────────┐
│ mx_erased                           │
│   base: *const mx_base_vtable ──────┼──► static vtable
├─────────────────────────────────────┤
│ (type-specific data follows...)     │
│   data: T                           │
│   interface_views: [...]            │
└─────────────────────────────────────┘

Layout Guarantee

This type is #[repr(C)] and its layout is frozen. The base field will always be at offset 0, and new fields will only be appended.

Generated By

#[derive(ExternalPtr)] generates wrapper structs that place mx_erased as the first field for proper layout.

Fields

base: *const mx_base_vtable

Pointer to the base vtable.

This must point to a valid, static vtable for the lifetime of the object. The vtable is typically a static generated by #[derive(ExternalPtr)].