105 lines
3.8 KiB
Rust
105 lines
3.8 KiB
Rust
//! Abstract definition of a matrix data storage allocator.
|
||
|
||
use std::any::Any;
|
||
|
||
use core::{DefaultAllocator, Scalar};
|
||
use core::constraint::{SameNumberOfColumns, SameNumberOfRows, ShapeConstraint};
|
||
use core::dimension::{Dim, U1};
|
||
use core::storage::ContiguousStorageMut;
|
||
|
||
/// A matrix allocator of a memory buffer that may contain `R::to_usize() * C::to_usize()`
|
||
/// elements of type `N`.
|
||
///
|
||
/// An allocator is said to be:
|
||
/// − static: if `R` and `C` both implement `DimName`.
|
||
/// − dynamic: if either one (or both) of `R` or `C` is equal to `Dynamic`.
|
||
///
|
||
/// Every allocator must be both static and dynamic. Though not all implementations may share the
|
||
/// same `Buffer` type.
|
||
pub trait Allocator<N: Scalar, R: Dim, C: Dim = U1>: Any + Sized {
|
||
/// The type of buffer this allocator can instanciate.
|
||
type Buffer: ContiguousStorageMut<N, R, C> + Clone;
|
||
|
||
/// Allocates a buffer with the given number of rows and columns without initializing its content.
|
||
unsafe fn allocate_uninitialized(nrows: R, ncols: C) -> Self::Buffer;
|
||
|
||
/// Allocates a buffer initialized with the content of the given iterator.
|
||
fn allocate_from_iterator<I: IntoIterator<Item = N>>(
|
||
nrows: R,
|
||
ncols: C,
|
||
iter: I,
|
||
) -> Self::Buffer;
|
||
}
|
||
|
||
/// A matrix reallocator. Changes the size of the memory buffer that initially contains (RFrom ×
|
||
/// CFrom) elements to a smaller or larger size (RTo, CTo).
|
||
pub trait Reallocator<N: Scalar, RFrom: Dim, CFrom: Dim, RTo: Dim, CTo: Dim>
|
||
: Allocator<N, RFrom, CFrom> + Allocator<N, RTo, CTo> {
|
||
/// Reallocates a buffer of shape `(RTo, CTo)`, possibly reusing a previously allocated buffer
|
||
/// `buf`. Data stored by `buf` are linearly copied to the output:
|
||
///
|
||
/// * The copy is performed as if both were just arrays (without a matrix structure).
|
||
/// * If `buf` is larger than the output size, then extra elements of `buf` are truncated.
|
||
/// * If `buf` is smaller than the output size, then extra elements of the output are left
|
||
/// uninitialized.
|
||
unsafe fn reallocate_copy(
|
||
nrows: RTo,
|
||
ncols: CTo,
|
||
buf: <Self as Allocator<N, RFrom, CFrom>>::Buffer,
|
||
) -> <Self as Allocator<N, RTo, CTo>>::Buffer;
|
||
}
|
||
|
||
/// The number of rows of the result of a componentwise operation on two matrices.
|
||
pub type SameShapeR<R1, R2> = <ShapeConstraint as SameNumberOfRows<R1, R2>>::Representative;
|
||
|
||
/// The number of columns of the result of a componentwise operation on two matrices.
|
||
pub type SameShapeC<C1, C2> = <ShapeConstraint as SameNumberOfColumns<C1, C2>>::Representative;
|
||
|
||
// FIXME: Bad name.
|
||
/// Restricts the given number of rows and columns to be respectively the same.
|
||
pub trait SameShapeAllocator<N, R1, C1, R2, C2>
|
||
: Allocator<N, R1, C1> + Allocator<N, SameShapeR<R1, R2>, SameShapeC<C1, C2>>
|
||
where
|
||
R1: Dim,
|
||
R2: Dim,
|
||
C1: Dim,
|
||
C2: Dim,
|
||
N: Scalar,
|
||
ShapeConstraint: SameNumberOfRows<R1, R2> + SameNumberOfColumns<C1, C2>,
|
||
{
|
||
}
|
||
|
||
impl<N, R1, R2, C1, C2> SameShapeAllocator<N, R1, C1, R2, C2> for DefaultAllocator
|
||
where
|
||
R1: Dim,
|
||
R2: Dim,
|
||
C1: Dim,
|
||
C2: Dim,
|
||
N: Scalar,
|
||
DefaultAllocator: Allocator<N, R1, C1> + Allocator<N, SameShapeR<R1, R2>, SameShapeC<C1, C2>>,
|
||
ShapeConstraint: SameNumberOfRows<R1, R2> + SameNumberOfColumns<C1, C2>,
|
||
{
|
||
}
|
||
|
||
// XXX: Bad name.
|
||
/// Restricts the given number of rows to be equal.
|
||
pub trait SameShapeVectorAllocator<N, R1, R2>
|
||
: Allocator<N, R1> + Allocator<N, SameShapeR<R1, R2>> + SameShapeAllocator<N, R1, U1, R2, U1>
|
||
where
|
||
R1: Dim,
|
||
R2: Dim,
|
||
N: Scalar,
|
||
ShapeConstraint: SameNumberOfRows<R1, R2>,
|
||
{
|
||
}
|
||
|
||
impl<N, R1, R2> SameShapeVectorAllocator<N, R1, R2> for DefaultAllocator
|
||
where
|
||
R1: Dim,
|
||
R2: Dim,
|
||
N: Scalar,
|
||
DefaultAllocator: Allocator<N, R1, U1> + Allocator<N, SameShapeR<R1, R2>>,
|
||
ShapeConstraint: SameNumberOfRows<R1, R2>,
|
||
{
|
||
}
|