Struct OptionDef

#[non_exhaustive]
#[repr(C)]
pub struct OptionDef {
    pub vtable: &'static OptionVTable,
    pub t: fn() -> &'static Shape,
}

Describes an Option — including a vtable to query and alter its state, and the inner shape (the T in Option<T>).

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

vtable: &'static OptionVTable

vtable for interacting with the option

t: fn() -> &'static Shape

shape of the inner type of the option

Implementations

impl OptionDef

pub const fn builder() -> OptionDefBuilder

Returns a builder for OptionDef

pub fn t(&self) -> &'static Shape

Returns the inner type shape of the option

Trait Implementations

impl Clone for OptionDef

fn clone(&self) -> OptionDef

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for OptionDef

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

Formats the value using the given formatter.

impl Hash for OptionDef

fn hash<__H>(&self, state: &mut __H)

where __H: Hasher,

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 OptionDef

fn eq(&self, other: &OptionDef) -> 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 OptionDef

impl Eq for OptionDef

impl StructuralPartialEq for OptionDef