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