blob: 359d1dc8389c3646b15d92393ed8f45fd198d14a (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
|
const std = @import("std");
const expect = std.testing.expect;
test "pointer casting" {
const bytes align(@alignOf(u32)) = [_]u8{ 0x12, 0x12, 0x12, 0x12 };
const u32_ptr: *const u32 = @ptrCast(&bytes);
try expect(u32_ptr.* == 0x12121212);
// Even this example is contrived - there are better ways to do the above than
// pointer casting. For example, using a slice narrowing cast:
const u32_value = std.mem.bytesAsSlice(u32, bytes[0..])[0];
try expect(u32_value == 0x12121212);
// And even another way, the most straightforward way to do it:
try expect(@as(u32, @bitCast(bytes)) == 0x12121212);
}
test "pointer child type" {
// pointer types have a `child` field which tells you the type they point to.
try expect(@typeInfo(*u32).pointer.child == u32);
}
// test
|
