# Enum rustc_const_eval::interpret::MemPlaceMeta

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    pub enum MemPlaceMeta<Prov: Provenance = CtfeProvenance> {
        Meta(Scalar<Prov>),
        None,
    }

Expand description

Information required for the sound usage of a `MemPlace`.

## Variants§

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### Meta(Scalar<Prov>)

The unsized payload (e.g. length for slices or vtable pointer for trait objects).

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### None

`Sized` types or unsized `extern type`

## Implementations§

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### impl<Prov: Provenance> MemPlaceMeta<Prov>

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#### pub fn unwrap_meta(self) -> Scalar<Prov>

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#### pub fn has_meta(self) -> bool

## Trait Implementations§

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### impl<Prov: Clone + Provenance> Clone for MemPlaceMeta<Prov>

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#### fn clone(&self) -> MemPlaceMeta<Prov>

Returns a copy of the value. Read more
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#### fn clone_from(&mut self, source: &Self)

Performs copy-assignment from `source`. Read more
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### impl<Prov: Debug + Provenance> Debug for MemPlaceMeta<Prov>

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

Formats the value using the given formatter. Read more
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### impl<Prov: Hash + Provenance> Hash for MemPlaceMeta<Prov>

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

Feeds this value into the given `Hasher`. Read more
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#### fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given `Hasher`. Read more
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### impl<Prov: PartialEq + Provenance> PartialEq for MemPlaceMeta<Prov>

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#### fn eq(&self, other: &MemPlaceMeta<Prov>) -> bool

This method tests for `self` and `other` values to be equal, and is used by `==`.
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#### fn ne(&self, other: &Rhs) -> bool

This method tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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### impl<Prov: Copy + Provenance> Copy for MemPlaceMeta<Prov>

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### impl<Prov: Eq + Provenance> Eq for MemPlaceMeta<Prov>

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### impl<Prov: Provenance> StructuralEq for MemPlaceMeta<Prov>

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### impl<Prov: Provenance> StructuralPartialEq for MemPlaceMeta<Prov>

## Auto Trait Implementations§

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### impl<Prov> RefUnwindSafe for MemPlaceMeta<Prov>
where Prov: RefUnwindSafe,

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### impl<Prov> Send for MemPlaceMeta<Prov>
where Prov: Send,

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### impl<Prov> Sync for MemPlaceMeta<Prov>
where Prov: Sync,

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### impl<Prov> Unpin for MemPlaceMeta<Prov>
where Prov: Unpin,

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### impl<Prov> UnwindSafe for MemPlaceMeta<Prov>
where Prov: UnwindSafe,

## Blanket Implementations§

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### impl<T> Any for T
where T: 'static + ?Sized,

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#### fn type_id(&self) -> TypeId

Gets the `TypeId` of `self`. Read more
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### impl<T> Borrow<T> for T
where T: ?Sized,

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#### fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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### impl<T> BorrowMut<T> for T
where T: ?Sized,

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#### fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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### impl<T> From<T> for T

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#### fn from(t: T) -> T

Returns the argument unchanged.

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### impl<T, U> Into<U> for T
where U: From<T>,

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#### fn into(self) -> U

Calls `U::from(self)`.

That is, this conversion is whatever the implementation of `From<T> for U` chooses to do.

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### impl<T> ToOwned for T
where T: Clone,

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#### type Owned = T

The resulting type after obtaining ownership.
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#### fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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#### fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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### impl<T, U> TryFrom<U> for T
where U: Into<T>,

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#### type Error = Infallible

The type returned in the event of a conversion error.
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#### fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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### impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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#### type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.

## Layout§

Note: Unable to compute type layout, possibly due to this type having generic parameters. Layout can only be computed for concrete, fully-instantiated types.