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impl Borrow and BorrowMut for fixed size matrices

This commit is contained in:
Joshua Smith 2021-07-07 13:26:19 -05:00
parent 1fc29dcf63
commit 2279da446e
1 changed files with 23 additions and 7 deletions
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30
src/base/conversion.rs
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@ -2,6 +2,7 @@
use alloc::vec::Vec;
use simba::scalar::{SubsetOf, SupersetOf};
use std::convert::{AsMut, AsRef, From, Into};
use std::borrow::{Borrow, BorrowMut};
use simba::simd::{PrimitiveSimdValue, SimdValue};
@ -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);