1const std = @import("std");
 2const expect = std.testing.expect;
 3
 4test "pointer casting" {
 5    const bytes align(@alignOf(u32)) = [_]u8{ 0x12, 0x12, 0x12, 0x12 };
 6    const u32_ptr: *const u32 = @ptrCast(&bytes);
 7    try expect(u32_ptr.* == 0x12121212);
 8
 9    // Even this example is contrived - there are better ways to do the above than
10    // pointer casting. For example, using a slice narrowing cast:
11    const u32_value = std.mem.bytesAsSlice(u32, bytes[0..])[0];
12    try expect(u32_value == 0x12121212);
13
14    // And even another way, the most straightforward way to do it:
15    try expect(@as(u32, @bitCast(bytes)) == 0x12121212);
16}
17
18test "pointer child type" {
19    // pointer types have a `child` field which tells you the type they point to.
20    try expect(@typeInfo(*u32).pointer.child == u32);
21}
22
23// test