forked from M-Labs/nalgebra
298 lines
13 KiB
Rust
298 lines
13 KiB
Rust
use crate::base::dimension::{Dim, DimName, Dynamic, U1};
|
||
use crate::base::matrix_slice::{SliceStorage, SliceStorageMut};
|
||
use crate::base::{MatrixSliceMN, MatrixSliceMutMN, Scalar};
|
||
|
||
use num_rational::Ratio;
|
||
|
||
/// # Creating matrix slices from `&[T]`
|
||
impl<'a, N: Scalar, R: Dim, C: Dim, RStride: Dim, CStride: Dim>
|
||
MatrixSliceMN<'a, N, R, C, RStride, CStride>
|
||
{
|
||
/// Creates, without bound-checking, a matrix slice from an array and with dimensions and strides specified by generic types instances.
|
||
///
|
||
/// This method is unsafe because the input data array is not checked to contain enough elements.
|
||
/// The generic types `R`, `C`, `RStride`, `CStride` can either be type-level integers or integers wrapped with `Dynamic::new()`.
|
||
#[inline]
|
||
pub unsafe fn from_slice_with_strides_generic_unchecked(
|
||
data: &'a [N],
|
||
start: usize,
|
||
nrows: R,
|
||
ncols: C,
|
||
rstride: RStride,
|
||
cstride: CStride,
|
||
) -> Self {
|
||
let data = SliceStorage::from_raw_parts(
|
||
data.as_ptr().offset(start as isize),
|
||
(nrows, ncols),
|
||
(rstride, cstride),
|
||
);
|
||
Self::from_data(data)
|
||
}
|
||
|
||
/// Creates a matrix slice from an array and with dimensions and strides specified by generic types instances.
|
||
///
|
||
/// Panics if the input data array dose not contain enough elements.
|
||
/// The generic types `R`, `C`, `RStride`, `CStride` can either be type-level integers or integers wrapped with `Dynamic::new()`.
|
||
#[inline]
|
||
pub fn from_slice_with_strides_generic(
|
||
data: &'a [N],
|
||
nrows: R,
|
||
ncols: C,
|
||
rstride: RStride,
|
||
cstride: CStride,
|
||
) -> Self {
|
||
// NOTE: The assertion implements the following formula, but without subtractions to avoid
|
||
// underflow panics:
|
||
// len >= (ncols - 1) * cstride + (nrows - 1) * rstride + 1
|
||
assert!(
|
||
data.len() + cstride.value() + rstride.value()
|
||
>= ncols.value() * cstride.value() + nrows.value() * rstride.value() + 1,
|
||
"Matrix slice: input data buffer to small."
|
||
);
|
||
|
||
unsafe {
|
||
Self::from_slice_with_strides_generic_unchecked(data, 0, nrows, ncols, rstride, cstride)
|
||
}
|
||
}
|
||
}
|
||
|
||
impl<'a, N: Scalar, R: Dim, C: Dim> MatrixSliceMN<'a, N, R, C> {
|
||
/// Creates, without bound-checking, a matrix slice from an array and with dimensions specified by generic types instances.
|
||
///
|
||
/// This method is unsafe because the input data array is not checked to contain enough elements.
|
||
/// The generic types `R` and `C` can either be type-level integers or integers wrapped with `Dynamic::new()`.
|
||
#[inline]
|
||
pub unsafe fn from_slice_generic_unchecked(
|
||
data: &'a [N],
|
||
start: usize,
|
||
nrows: R,
|
||
ncols: C,
|
||
) -> Self {
|
||
Self::from_slice_with_strides_generic_unchecked(data, start, nrows, ncols, U1, nrows)
|
||
}
|
||
|
||
/// Creates a matrix slice from an array and with dimensions and strides specified by generic types instances.
|
||
///
|
||
/// Panics if the input data array dose not contain enough elements.
|
||
/// The generic types `R` and `C` can either be type-level integers or integers wrapped with `Dynamic::new()`.
|
||
#[inline]
|
||
pub fn from_slice_generic(data: &'a [N], nrows: R, ncols: C) -> Self {
|
||
Self::from_slice_with_strides_generic(data, nrows, ncols, U1, nrows)
|
||
}
|
||
}
|
||
|
||
macro_rules! impl_constructors(
|
||
($($Dims: ty),*; $(=> $DimIdent: ident: $DimBound: ident),*; $($gargs: expr),*; $($args: ident),*) => {
|
||
impl<'a, N: Scalar, $($DimIdent: $DimBound),*> MatrixSliceMN<'a, N, $($Dims),*> {
|
||
/// Creates a new matrix slice from the given data array.
|
||
///
|
||
/// Panics if `data` does not contain enough elements.
|
||
#[inline]
|
||
pub fn from_slice(data: &'a [N], $($args: usize),*) -> Self {
|
||
Self::from_slice_generic(data, $($gargs),*)
|
||
}
|
||
|
||
/// Creates, without bound checking, a new matrix slice from the given data array.
|
||
#[inline]
|
||
pub unsafe fn from_slice_unchecked(data: &'a [N], start: usize, $($args: usize),*) -> Self {
|
||
Self::from_slice_generic_unchecked(data, start, $($gargs),*)
|
||
}
|
||
}
|
||
|
||
impl<'a, N: Scalar, $($DimIdent: $DimBound, )*> MatrixSliceMN<'a, N, $($Dims,)* Dynamic, Dynamic> {
|
||
/// Creates a new matrix slice with the specified strides from the given data array.
|
||
///
|
||
/// Panics if `data` does not contain enough elements.
|
||
#[inline]
|
||
pub fn from_slice_with_strides(data: &'a [N], $($args: usize,)* rstride: usize, cstride: usize) -> Self {
|
||
Self::from_slice_with_strides_generic(data, $($gargs,)* Dynamic::new(rstride), Dynamic::new(cstride))
|
||
}
|
||
|
||
/// Creates, without bound checking, a new matrix slice with the specified strides from the given data array.
|
||
#[inline]
|
||
pub unsafe fn from_slice_with_strides_unchecked(data: &'a [N], start: usize, $($args: usize,)* rstride: usize, cstride: usize) -> Self {
|
||
Self::from_slice_with_strides_generic_unchecked(data, start, $($gargs,)* Dynamic::new(rstride), Dynamic::new(cstride))
|
||
}
|
||
}
|
||
}
|
||
);
|
||
|
||
// TODO: this is not very pretty. We could find a better call syntax.
|
||
impl_constructors!(R, C; // Arguments for Matrix<N, ..., S>
|
||
=> R: DimName, => C: DimName; // Type parameters for impl<N, ..., S>
|
||
R::name(), C::name(); // Arguments for `_generic` constructors.
|
||
); // Arguments for non-generic constructors.
|
||
|
||
impl_constructors!(R, Dynamic;
|
||
=> R: DimName;
|
||
R::name(), Dynamic::new(ncols);
|
||
ncols);
|
||
|
||
impl_constructors!(Dynamic, C;
|
||
=> C: DimName;
|
||
Dynamic::new(nrows), C::name();
|
||
nrows);
|
||
|
||
impl_constructors!(Dynamic, Dynamic;
|
||
;
|
||
Dynamic::new(nrows), Dynamic::new(ncols);
|
||
nrows, ncols);
|
||
|
||
/// # Creating mutable matrix slices from `&mut [T]`
|
||
impl<'a, N: Scalar, R: Dim, C: Dim, RStride: Dim, CStride: Dim>
|
||
MatrixSliceMutMN<'a, N, R, C, RStride, CStride>
|
||
{
|
||
/// Creates, without bound-checking, a mutable matrix slice from an array and with dimensions and strides specified by generic types instances.
|
||
///
|
||
/// This method is unsafe because the input data array is not checked to contain enough elements.
|
||
/// The generic types `R`, `C`, `RStride`, `CStride` can either be type-level integers or integers wrapped with `Dynamic::new()`.
|
||
#[inline]
|
||
pub unsafe fn from_slice_with_strides_generic_unchecked(
|
||
data: &'a mut [N],
|
||
start: usize,
|
||
nrows: R,
|
||
ncols: C,
|
||
rstride: RStride,
|
||
cstride: CStride,
|
||
) -> Self {
|
||
let data = SliceStorageMut::from_raw_parts(
|
||
data.as_mut_ptr().offset(start as isize),
|
||
(nrows, ncols),
|
||
(rstride, cstride),
|
||
);
|
||
Self::from_data(data)
|
||
}
|
||
|
||
/// Creates a mutable matrix slice from an array and with dimensions and strides specified by generic types instances.
|
||
///
|
||
/// Panics if the input data array dose not contain enough elements.
|
||
/// The generic types `R`, `C`, `RStride`, `CStride` can either be type-level integers or integers wrapped with `Dynamic::new()`.
|
||
#[inline]
|
||
pub fn from_slice_with_strides_generic(
|
||
data: &'a mut [N],
|
||
nrows: R,
|
||
ncols: C,
|
||
rstride: RStride,
|
||
cstride: CStride,
|
||
) -> Self {
|
||
// NOTE: The assertion implements the following formula, but without subtractions to avoid
|
||
// underflow panics:
|
||
// len >= (ncols - 1) * cstride + (nrows - 1) * rstride + 1
|
||
assert!(
|
||
data.len() + cstride.value() + rstride.value()
|
||
>= ncols.value() * cstride.value() + nrows.value() * rstride.value() + 1,
|
||
"Matrix slice: input data buffer to small."
|
||
);
|
||
|
||
assert!(
|
||
{
|
||
let nrows = nrows.value();
|
||
let ncols = ncols.value();
|
||
let rstride = rstride.value();
|
||
let cstride = cstride.value();
|
||
|
||
nrows * ncols <= 1
|
||
|| match (rstride, cstride) {
|
||
(0, 0) => false, // otherwise: matrix[(0, 0)] == index[(nrows - 1, ncols - 1)],
|
||
(0, _) => nrows <= 1, // otherwise: matrix[(0, 0)] == index[(nrows - 1, 0)],
|
||
(_, 0) => ncols <= 1, // otherwise: matrix[(0, 0)] == index[(0, ncols - 1)],
|
||
(_, _) => {
|
||
// otherwise: matrix[(0, numer)] == index[(denom, 0)]
|
||
let ratio = Ratio::new(rstride, cstride);
|
||
nrows <= *ratio.denom() || ncols <= *ratio.numer()
|
||
}
|
||
}
|
||
},
|
||
"Matrix slice: dimensions and strides result in aliased indices."
|
||
);
|
||
|
||
unsafe {
|
||
Self::from_slice_with_strides_generic_unchecked(data, 0, nrows, ncols, rstride, cstride)
|
||
}
|
||
}
|
||
}
|
||
|
||
impl<'a, N: Scalar, R: Dim, C: Dim> MatrixSliceMutMN<'a, N, R, C> {
|
||
/// Creates, without bound-checking, a mutable matrix slice from an array and with dimensions specified by generic types instances.
|
||
///
|
||
/// This method is unsafe because the input data array is not checked to contain enough elements.
|
||
/// The generic types `R` and `C` can either be type-level integers or integers wrapped with `Dynamic::new()`.
|
||
#[inline]
|
||
pub unsafe fn from_slice_generic_unchecked(
|
||
data: &'a mut [N],
|
||
start: usize,
|
||
nrows: R,
|
||
ncols: C,
|
||
) -> Self {
|
||
Self::from_slice_with_strides_generic_unchecked(data, start, nrows, ncols, U1, nrows)
|
||
}
|
||
|
||
/// Creates a mutable matrix slice from an array and with dimensions and strides specified by generic types instances.
|
||
///
|
||
/// Panics if the input data array dose not contain enough elements.
|
||
/// The generic types `R` and `C` can either be type-level integers or integers wrapped with `Dynamic::new()`.
|
||
#[inline]
|
||
pub fn from_slice_generic(data: &'a mut [N], nrows: R, ncols: C) -> Self {
|
||
Self::from_slice_with_strides_generic(data, nrows, ncols, U1, nrows)
|
||
}
|
||
}
|
||
|
||
macro_rules! impl_constructors_mut(
|
||
($($Dims: ty),*; $(=> $DimIdent: ident: $DimBound: ident),*; $($gargs: expr),*; $($args: ident),*) => {
|
||
impl<'a, N: Scalar, $($DimIdent: $DimBound),*> MatrixSliceMutMN<'a, N, $($Dims),*> {
|
||
/// Creates a new mutable matrix slice from the given data array.
|
||
///
|
||
/// Panics if `data` does not contain enough elements.
|
||
#[inline]
|
||
pub fn from_slice(data: &'a mut [N], $($args: usize),*) -> Self {
|
||
Self::from_slice_generic(data, $($gargs),*)
|
||
}
|
||
|
||
/// Creates, without bound checking, a new mutable matrix slice from the given data array.
|
||
#[inline]
|
||
pub unsafe fn from_slice_unchecked(data: &'a mut [N], start: usize, $($args: usize),*) -> Self {
|
||
Self::from_slice_generic_unchecked(data, start, $($gargs),*)
|
||
}
|
||
}
|
||
|
||
impl<'a, N: Scalar, $($DimIdent: $DimBound, )*> MatrixSliceMutMN<'a, N, $($Dims,)* Dynamic, Dynamic> {
|
||
/// Creates a new mutable matrix slice with the specified strides from the given data array.
|
||
///
|
||
/// Panics if `data` does not contain enough elements.
|
||
#[inline]
|
||
pub fn from_slice_with_strides_mut(data: &'a mut [N], $($args: usize,)* rstride: usize, cstride: usize) -> Self {
|
||
Self::from_slice_with_strides_generic(
|
||
data, $($gargs,)* Dynamic::new(rstride), Dynamic::new(cstride))
|
||
}
|
||
|
||
/// Creates, without bound checking, a new mutable matrix slice with the specified strides from the given data array.
|
||
#[inline]
|
||
pub unsafe fn from_slice_with_strides_unchecked(data: &'a mut [N], start: usize, $($args: usize,)* rstride: usize, cstride: usize) -> Self {
|
||
Self::from_slice_with_strides_generic_unchecked(
|
||
data, start, $($gargs,)* Dynamic::new(rstride), Dynamic::new(cstride))
|
||
}
|
||
}
|
||
}
|
||
);
|
||
|
||
// TODO: this is not very pretty. We could find a better call syntax.
|
||
impl_constructors_mut!(R, C; // Arguments for Matrix<N, ..., S>
|
||
=> R: DimName, => C: DimName; // Type parameters for impl<N, ..., S>
|
||
R::name(), C::name(); // Arguments for `_generic` constructors.
|
||
); // Arguments for non-generic constructors.
|
||
|
||
impl_constructors_mut!(R, Dynamic;
|
||
=> R: DimName;
|
||
R::name(), Dynamic::new(ncols);
|
||
ncols);
|
||
|
||
impl_constructors_mut!(Dynamic, C;
|
||
=> C: DimName;
|
||
Dynamic::new(nrows), C::name();
|
||
nrows);
|
||
|
||
impl_constructors_mut!(Dynamic, Dynamic;
|
||
;
|
||
Dynamic::new(nrows), Dynamic::new(ncols);
|
||
nrows, ncols);
|