Struct kul::datum::DatumBox

pub struct DatumBox<TT, ET>(pub Box<BoxDatum<TT, ET>>);

This wrapper allows the needed recursive type definition for Box to be used as the Datum reference type.

Methods

impl<TT, ET> DatumBox<TT, ET>

pub fn new(val: BoxDatum<TT, ET>) -> Self

Make a Boxed Datum with value from the given argument.

Trait Implementations

impl<TT, ET> Algo1DatumRef for DatumBox<TT, ET>

This allows using the custom drop algorithm

fn try_replace(
    this: &mut Self,
    val: Self::Target
) -> Result<Self::Target, Self::Target>

Returns the inner Datum and replaces it with the given value, if possible. Otherwise, an error is returned containing the passed-in value. Some implementations might always succeed.

fn set(this: &mut Self, val: Self::Target)

Mutates the inner Datum to be the given value. This must never fail. It is only called after our try_replace function is called on the same this value and succeeded, which allows this set function to never fail.

impl<TT, ET> Drop for DatumBox<TT, ET>

Use algorithm #1 for dropping, to avoid extensive drop recursion.

fn drop(&mut self)

Executes the destructor for this type.

impl<TT: PartialEq, ET: PartialEq> PartialEq<DatumBox<TT, ET>> for DatumBox<TT, ET>

fn eq(&self, other: &DatumBox<TT, ET>) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &DatumBox<TT, ET>) -> bool

This method tests for !=.

impl<TT: Clone, ET: Clone> Clone for DatumBox<TT, ET>

fn clone(&self) -> DatumBox<TT, ET>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<TT: Eq, ET: Eq> Eq for DatumBox<TT, ET>

impl<TT, ET> DerefMut for DatumBox<TT, ET>

Not strictly required but useful.

fn deref_mut(&mut self) -> &mut Self::Target

Mutably dereferences the value.

impl<TT: Debug, ET: Debug> Debug for DatumBox<TT, ET>

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

Formats the value using the given formatter.

impl<TT: Hash, ET: Hash> Hash for DatumBox<TT, ET>

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

Feeds this value into the given [Hasher].

fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher, 

Feeds a slice of this type into the given [Hasher].

impl<TT, ET> Deref for DatumBox<TT, ET>

Required by DerefTryMut.

type Target = BoxDatum<TT, ET>

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl<TT, ET> DerefTryMut for DatumBox<TT, ET>

This allows Box to be used as the Datum reference type.

fn get_mut(this: &mut Self) -> Option<&mut Self::Target>

Returns a mutable reference to the inner Datum if it can. Otherwise, returns None. Some implementations may never return None (e.g. for types that also implement DerefMut).