ring/polyfill/
array_split_map.rs

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1// Copyright 2023 Brian Smith.
2//
3// Permission to use, copy, modify, and/or distribute this software for any
4// purpose with or without fee is hereby granted, provided that the above
5// copyright notice and this permission notice appear in all copies.
6//
7// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
8// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
9// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
10// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
11// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
12// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
13// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
14
15pub trait ArraySplitMap<I, O, const CN: usize, const ON: usize> {
16    fn array_split_map(self, f: impl Fn([I; CN]) -> O) -> [O; ON];
17}
18
19impl<I, O> ArraySplitMap<I, O, 4, 3> for [I; 12] {
20    #[inline]
21    fn array_split_map(self, f: impl Fn([I; 4]) -> O) -> [O; 3] {
22        let [a0, a1, a2, a3, b0, b1, b2, b3, c0, c1, c2, c3] = self;
23        [
24            f([a0, a1, a2, a3]),
25            f([b0, b1, b2, b3]),
26            f([c0, c1, c2, c3]),
27        ]
28    }
29}
30
31impl<I, O> ArraySplitMap<I, O, 4, 4> for [I; 16] {
32    #[inline]
33    fn array_split_map(self, f: impl Fn([I; 4]) -> O) -> [O; 4] {
34        let [a0, a1, a2, a3, b0, b1, b2, b3, c0, c1, c2, c3, d0, d1, d2, d3] = self;
35        [
36            f([a0, a1, a2, a3]),
37            f([b0, b1, b2, b3]),
38            f([c0, c1, c2, c3]),
39            f([d0, d1, d2, d3]),
40        ]
41    }
42}
43
44impl<I, O> ArraySplitMap<I, O, 4, 8> for [I; 32] {
45    #[inline]
46    fn array_split_map(self, f: impl Fn([I; 4]) -> O) -> [O; 8] {
47        let [a0, a1, a2, a3, b0, b1, b2, b3, c0, c1, c2, c3, d0, d1, d2, d3, e0, e1, e2, e3, f0, f1, f2, f3, g0, g1, g2, g3, h0, h1, h2, h3] =
48            self;
49        [
50            f([a0, a1, a2, a3]),
51            f([b0, b1, b2, b3]),
52            f([c0, c1, c2, c3]),
53            f([d0, d1, d2, d3]),
54            f([e0, e1, e2, e3]),
55            f([f0, f1, f2, f3]),
56            f([g0, g1, g2, g3]),
57            f([h0, h1, h2, h3]),
58        ]
59    }
60}
61
62impl<I, O> ArraySplitMap<I, O, 8, 2> for [I; 16] {
63    #[inline]
64    fn array_split_map(self, f: impl Fn([I; 8]) -> O) -> [O; 2] {
65        let [a0, a1, a2, a3, a4, a5, a6, a7, b0, b1, b2, b3, b4, b5, b6, b7] = self;
66        [
67            f([a0, a1, a2, a3, a4, a5, a6, a7]),
68            f([b0, b1, b2, b3, b4, b5, b6, b7]),
69        ]
70    }
71}
ring/polyfill/array_split_map.rs

ring/polyfill/
array_split_map.rs
