| 1 | const expectEqual = @import("std").testing.expectEqual; |
| 2 | |
| 3 | test "optional pointers" { |
| 4 | // Pointers cannot be null. If you want a null pointer, use the optional |
| 5 | // prefix `?` to make the pointer type optional. |
| 6 | var ptr: ?*i32 = null; |
| 7 | |
| 8 | var x: i32 = 1; |
| 9 | ptr = &x; |
| 10 | |
| 11 | try expectEqual(1, ptr.?.*); |
| 12 | |
| 13 | // Optional pointers are the same size as normal pointers, because pointer |
| 14 | // value 0 is used as the null value. |
| 15 | try expectEqual(@sizeOf(?*i32), @sizeOf(*i32)); |
| 16 | } |
| 17 | |
| 18 | // test |