enum MaybeCompactedCid {
Compact(CidV1DagCborBlake2b256),
Uncompactable(Uncompactable),
}
Expand description
The core primitive for saving space in this module.
CIDs contain a significant amount of static data (such as version, codec, hash identifier, hash length).
Nearly all Filecoin CIDs are V1
,DagCbor
encoded, and hashed with Blake2b256
(which has a hash
length of 256 bits (32 bytes)).
Naively representing such a CID requires 96 bytes but the non-static portion is only
32 bytes, represented as CidV1DagCborBlake2b256
.
In collections, choose to store only 32 bytes where possible.
Note that construction of CIDs should always go through this type, to ensure
- canonicalization
- the contract of
Uncompactable
assert_eq!(std::mem::size_of::<cid::Cid>(), 96);
If other types of CID become popular, they should be added to this enum
.
Variants§
Trait Implementations§
source§impl Clone for MaybeCompactedCid
impl Clone for MaybeCompactedCid
source§fn clone(&self) -> MaybeCompactedCid
fn clone(&self) -> MaybeCompactedCid
Returns a copy of the value. Read more
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from
source
. Read moresource§impl Debug for MaybeCompactedCid
impl Debug for MaybeCompactedCid
source§impl From<Cid<64>> for MaybeCompactedCid
impl From<Cid<64>> for MaybeCompactedCid
source§impl From<MaybeCompactedCid> for Cid
impl From<MaybeCompactedCid> for Cid
source§fn from(value: MaybeCompactedCid) -> Self
fn from(value: MaybeCompactedCid) -> Self
Converts to this type from the input type.
source§impl Hash for MaybeCompactedCid
impl Hash for MaybeCompactedCid
source§impl Ord for MaybeCompactedCid
impl Ord for MaybeCompactedCid
source§fn cmp(&self, other: &MaybeCompactedCid) -> Ordering
fn cmp(&self, other: &MaybeCompactedCid) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
Compares and returns the maximum of two values. Read more
source§impl PartialEq for MaybeCompactedCid
impl PartialEq for MaybeCompactedCid
source§fn eq(&self, other: &MaybeCompactedCid) -> bool
fn eq(&self, other: &MaybeCompactedCid) -> bool
This method tests for
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for MaybeCompactedCid
impl PartialOrd for MaybeCompactedCid
source§fn partial_cmp(&self, other: &MaybeCompactedCid) -> Option<Ordering>
fn partial_cmp(&self, other: &MaybeCompactedCid) -> Option<Ordering>
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
This method tests less than or equal to (for
self
and other
) and is used by the <=
operator. Read moreimpl Copy for MaybeCompactedCid
impl Eq for MaybeCompactedCid
impl StructuralPartialEq for MaybeCompactedCid
Auto Trait Implementations§
impl Freeze for MaybeCompactedCid
impl RefUnwindSafe for MaybeCompactedCid
impl Send for MaybeCompactedCid
impl Sync for MaybeCompactedCid
impl Unpin for MaybeCompactedCid
impl UnwindSafe for MaybeCompactedCid
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