1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
|
const std = @import("std");
const expectEqual = std.testing.expectEqual;
test "Basic vector usage" {
// Vectors have a compile-time known length and base type.
const a = @Vector(4, i32){ 1, 2, 3, 4 };
const b = @Vector(4, i32){ 5, 6, 7, 8 };
// Math operations take place element-wise.
const c = a + b;
// Individual vector elements can be accessed using array indexing syntax.
try expectEqual(6, c[0]);
try expectEqual(8, c[1]);
try expectEqual(10, c[2]);
try expectEqual(12, c[3]);
}
test "Conversion between vectors, arrays, and slices" {
// Vectors can be coerced to arrays, and vice versa.
const arr1: [4]f32 = [_]f32{ 1.1, 3.2, 4.5, 5.6 };
const vec: @Vector(4, f32) = arr1;
const arr2: [4]f32 = vec;
try expectEqual(arr1, arr2);
// You can also assign from a slice with comptime-known length to a vector using .*
const vec2: @Vector(2, f32) = arr1[1..3].*;
const slice: []const f32 = &arr1;
var offset: u32 = 1; // var to make it runtime-known
_ = &offset; // suppress 'var is never mutated' error
// To extract a comptime-known length from a runtime-known offset,
// first extract a new slice from the starting offset, then an array of
// comptime-known length
const vec3: @Vector(2, f32) = slice[offset..][0..2].*;
try expectEqual(slice[offset], vec2[0]);
try expectEqual(slice[offset + 1], vec2[1]);
try expectEqual(vec2, vec3);
}
// test
|
