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DatasetDescriptor

molframe_core::provider

Struct DatasetDescriptor 

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pub struct DatasetDescriptor { /* private fields */ }
Expand description

O(1) metadata for one logical dataset.

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impl DatasetDescriptor

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pub fn regular( id: DatasetId, payload: PayloadKind, logical_rows: u64, rows_per_chunk: u32, first_chunk: ChunkId, ) -> Result<Self, ProviderError>

Describes a regularly chunked logical dataset.

§Errors

Returns a typed error for zero chunk size or 64-bit arithmetic overflow.

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pub fn source_defined( id: DatasetId, payload: PayloadKind, logical_rows: u64, chunk_count: u64, first_chunk: ChunkId, target_rows: u32, ) -> Result<Self, ProviderError>

Describes source-defined chunk boundaries without storing each boundary.

§Errors

Returns a typed error for contradictory counts, zero target size, or chunk-identity overflow.

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pub const fn id(self) -> DatasetId

Stable dataset identity.

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pub const fn payload(self) -> PayloadKind

Typed payload produced for this dataset.

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pub const fn logical_rows(self) -> u64

Total logical rows, which may exceed u32::MAX.

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pub const fn chunk_count(self) -> u64

Number of chunks, represented without a per-chunk vector.

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pub const fn first_chunk(self) -> ChunkId

First stable chunk identity.

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pub const fn layout(self) -> ChunkLayout

Chunk-boundary policy.

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pub fn regular_chunk( self, chunk: ChunkId, ) -> Result<ChunkDescriptor, ProviderError>

Resolves a regular chunk in constant time.

§Errors

Returns ProviderError::UnknownChunk for a foreign chunk or when the source owns its own boundaries.

Trait Implementations§

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impl Clone for DatasetDescriptor

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fn clone(&self) -> Self

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

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

Performs copy-assignment from source. Read more
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impl Copy for DatasetDescriptor

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impl Debug for DatasetDescriptor

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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 Eq for DatasetDescriptor

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impl PartialEq for DatasetDescriptor

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fn eq(&self, other: &Self) -> bool

Equality operator ==. Read more
1.0.0 (const: unstable) · Source§

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=. Read more
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impl StructuralPartialEq for DatasetDescriptor

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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> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
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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> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self> ⓘ

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self> ⓘ
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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impl<T> Pointable for T

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const ALIGN: usize

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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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 = !

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

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.