postcard_schema/impls/
nalgebra_v0_33.rs

1//! Implementations of the [`Schema`] trait for the `nalgebra` crate v0.33
2
3use crate::{
4    schema::{DataModelType, NamedType},
5    Schema,
6};
7
8#[cfg_attr(docsrs, doc(cfg(feature = "nalgebra-v0_33")))]
9impl<T, const R: usize, const C: usize> Schema
10    for nalgebra_v0_33::Matrix<
11        T,
12        nalgebra_v0_33::Const<R>,
13        nalgebra_v0_33::Const<C>,
14        nalgebra_v0_33::ArrayStorage<T, R, C>,
15    >
16where
17    T: Schema + nalgebra_v0_33::Scalar,
18{
19    const SCHEMA: &'static NamedType = &NamedType {
20        name: "nalgebra::Matrix<T, R, C, ArrayStorage<T, R, C>>",
21        ty: &DataModelType::Tuple(flatten(&[[T::SCHEMA; R]; C])),
22    };
23}
24
25#[cfg_attr(docsrs, doc(cfg(feature = "nalgebra-v0_33")))]
26impl<T: Schema> Schema for nalgebra_v0_33::Unit<T> {
27    const SCHEMA: &'static NamedType = T::SCHEMA;
28}
29
30#[cfg_attr(docsrs, doc(cfg(feature = "nalgebra-v0_33")))]
31impl<T: Schema + nalgebra_v0_33::Scalar> Schema for nalgebra_v0_33::Quaternion<T> {
32    const SCHEMA: &'static NamedType = nalgebra_v0_33::Vector4::<T>::SCHEMA;
33}
34
35/// Const version of the const-unstable [`<[[T; N]]>::as_flattened()`]
36const fn flatten<T, const N: usize>(slice: &[[T; N]]) -> &[T] {
37    const {
38        assert!(size_of::<T>() != 0);
39    }
40    // SAFETY: `self.len() * N` cannot overflow because `self` is
41    // already in the address space.
42    let len = unsafe { slice.len().unchecked_mul(N) };
43    // SAFETY: `[T]` is layout-identical to `[T; N]`
44    unsafe { core::slice::from_raw_parts(slice.as_ptr().cast(), len) }
45}
46
47#[test]
48fn flattened() {
49    type T = nalgebra_v0_33::SMatrix<u8, 3, 3>;
50    assert_eq!(T::SCHEMA.ty, <[u8; 9]>::SCHEMA.ty);
51}
52
53#[test]
54fn smoke() {
55    let x = nalgebra_v0_33::SMatrix::<u8, 3, 3>::new(1, 2, 3, 4, 5, 6, 7, 8, 9);
56    let y = postcard::to_stdvec(&x).unwrap();
57    assert_eq!(&[1, 4, 7, 2, 5, 8, 3, 6, 9], y.as_slice());
58}
postcard_schema/impls/nalgebra_v0_33.rs

postcard_schema/impls/
nalgebra_v0_33.rs
