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Implemented Borrow and BorrowMut on fixed size matrices #937

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merged 2 commits into from Jul 11, 2021
Merged

Implemented Borrow and BorrowMut on fixed size matrices #937

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2279da4
impl Borrow and BorrowMut for fixed size matrices
jsmith628 Jul 7, 2021
a7fe7a5
fixed check-fmt error
jsmith628 Jul 8, 2021
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30 changes: 23 additions & 7 deletions src/base/conversion.rs
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@@ -1,6 +1,7 @@
#[cfg(all(feature = "alloc", not(feature = "std")))]
use alloc::vec::Vec;
use simba::scalar::{SubsetOf, SupersetOf};
use std::borrow::{Borrow, BorrowMut};
use std::convert::{AsMut, AsRef, From, Into};

use simba::simd::{PrimitiveSimdValue, SimdValue};
Expand Down Expand Up @@ -192,32 +193,47 @@ impl<T: Scalar, const R: usize, const C: usize> From<SMatrix<T, R, C>> for [[T;
}
}

macro_rules! impl_from_into_asref_2D(
($(($NRows: ty, $NCols: ty) => ($SZRows: expr, $SZCols: expr));* $(;)*) => {$(
impl<T: Scalar, S> AsRef<[[T; $SZRows]; $SZCols]> for Matrix<T, $NRows, $NCols, S>
macro_rules! impl_from_into_asref_borrow_2D(

//does the impls on one case for either AsRef/AsMut and Borrow/BorrowMut
(
($NRows: ty, $NCols: ty) => ($SZRows: expr, $SZCols: expr);
$Ref:ident.$ref:ident(), $Mut:ident.$mut:ident()
) => {
impl<T: Scalar, S> $Ref<[[T; $SZRows]; $SZCols]> for Matrix<T, $NRows, $NCols, S>
where S: ContiguousStorage<T, $NRows, $NCols> {
#[inline]
fn as_ref(&self) -> &[[T; $SZRows]; $SZCols] {
fn $ref(&self) -> &[[T; $SZRows]; $SZCols] {
unsafe {
&*(self.data.ptr() as *const [[T; $SZRows]; $SZCols])
}
}
}

impl<T: Scalar, S> AsMut<[[T; $SZRows]; $SZCols]> for Matrix<T, $NRows, $NCols, S>
impl<T: Scalar, S> $Mut<[[T; $SZRows]; $SZCols]> for Matrix<T, $NRows, $NCols, S>
where S: ContiguousStorageMut<T, $NRows, $NCols> {
#[inline]
fn as_mut(&mut self) -> &mut [[T; $SZRows]; $SZCols] {
fn $mut(&mut self) -> &mut [[T; $SZRows]; $SZCols] {
unsafe {
&mut *(self.data.ptr_mut() as *mut [[T; $SZRows]; $SZCols])
}
}
}
};

//collects the mappings from typenum pairs to consts
($(($NRows: ty, $NCols: ty) => ($SZRows: expr, $SZCols: expr));* $(;)*) => {$(
impl_from_into_asref_borrow_2D!(
($NRows, $NCols) => ($SZRows, $SZCols); AsRef.as_ref(), AsMut.as_mut()
);
impl_from_into_asref_borrow_2D!(
($NRows, $NCols) => ($SZRows, $SZCols); Borrow.borrow(), BorrowMut.borrow_mut()
);
)*}
);

// Implement for matrices with shape 2x2 .. 6x6.
impl_from_into_asref_2D!(
impl_from_into_asref_borrow_2D!(
(U2, U2) => (2, 2); (U2, U3) => (2, 3); (U2, U4) => (2, 4); (U2, U5) => (2, 5); (U2, U6) => (2, 6);
(U3, U2) => (3, 2); (U3, U3) => (3, 3); (U3, U4) => (3, 4); (U3, U5) => (3, 5); (U3, U6) => (3, 6);
(U4, U2) => (4, 2); (U4, U3) => (4, 3); (U4, U4) => (4, 4); (U4, U5) => (4, 5); (U4, U6) => (4, 6);
Expand Down