| ... | ... | @@ -1,102 +0,0 @@ |
| 1 | | pub struct List#(T: type) { |
| 2 | | items: ?&T, |
| 3 | | length: isize, |
| 4 | | capacity: isize, |
| 5 | | |
| 6 | | pub fn deinit(l: &List) { |
| 7 | | free(l.items); |
| 8 | | l.items = null; |
| 9 | | } |
| 10 | | |
| 11 | | pub fn append(l: &List, item: T) -> error { |
| 12 | | const err = l.ensure_capacity(l.length + 1); |
| 13 | | if err != error.None { |
| 14 | | return err; |
| 15 | | } |
| 16 | | const raw_items = l.items ?? unreachable; |
| 17 | | l.raw_items[l.length] = item; |
| 18 | | l.length += 1; |
| 19 | | return 0; |
| 20 | | } |
| 21 | | |
| 22 | | pub fn at(l: List, index: usize) -> T { |
| 23 | | assert(index < l.length); |
| 24 | | const raw_items = l.items ?? unreachable; |
| 25 | | return raw_items[index]; |
| 26 | | } |
| 27 | | |
| 28 | | pub fn ptr_at(l: &List, index: usize) -> &T { |
| 29 | | assert(index < l.length); |
| 30 | | const raw_items = l.items ?? unreachable; |
| 31 | | return &raw_items[index]; |
| 32 | | } |
| 33 | | |
| 34 | | pub fn clear(l: &List) { |
| 35 | | l.length = 0; |
| 36 | | } |
| 37 | | |
| 38 | | pub fn pop(l: &List) -> T { |
| 39 | | assert(l.length >= 1); |
| 40 | | l.length -= 1; |
| 41 | | return l.items[l.length]; |
| 42 | | } |
| 43 | | |
| 44 | | fn ensure_capacity(l: &List, new_capacity: usize) -> error { |
| 45 | | var better_capacity = max(l.capacity, 16); |
| 46 | | while better_capacity < new_capacity { |
| 47 | | better_capacity *= 2; |
| 48 | | } |
| 49 | | if better_capacity != l.capacity { |
| 50 | | const new_items = realloc(l.items, better_capacity) ?? { return error.NoMem }; |
| 51 | | l.items = new_items; |
| 52 | | l.capacity = better_capacity; |
| 53 | | } |
| 54 | | error.None |
| 55 | | } |
| 56 | | } |
| 57 | | |
| 58 | | pub fn malloc#(T: type)(count: usize) -> ?&T { realloc(None, count) } |
| 59 | | |
| 60 | | pub fn realloc#(T: type)(ptr: ?&T, new_count: usize) -> ?&T { |
| 61 | | |
| 62 | | } |
| 63 | | |
| 64 | | pub fn free#(T: type)(ptr: ?&T) { |
| 65 | | |
| 66 | | } |
| 67 | | |
| 68 | | |
| 69 | | ////////////////// alternate |
| 70 | | |
| 71 | | // previously proposed but without -> |
| 72 | | fn max#(T: type)(a: T, b: T) T { |
| 73 | | if (a > b) a else b |
| 74 | | } |
| 75 | | |
| 76 | | // andy's new idea |
| 77 | | // parameters can reference other inline parameters. |
| 78 | | fn max(inline T: type, a: T, b: T) T { |
| 79 | | if (a > b) a else b |
| 80 | | } |
| 81 | | |
| 82 | | fn f() { |
| 83 | | const x: i32 = 1234; |
| 84 | | const y: i32 = 5678; |
| 85 | | const z = max(@typeof(x), x, y); |
| 86 | | } |
| 87 | | |
| 88 | | // So, type-generic functions don't need any fancy syntax. type-generic |
| 89 | | // containers still do, though: |
| 90 | | |
| 91 | | pub struct List(T: type) { |
| 92 | | items: ?&T, |
| 93 | | length: isize, |
| 94 | | capacity: isize, |
| 95 | | } |
| 96 | | |
| 97 | | // we don't need '#' to indicate type generic parameters. |
| 98 | | |
| 99 | | fn f() { |
| 100 | | var list: List(u8); |
| 101 | | } |
| 102 | | |
Andrew Kelley <andrew@ziglang.org> 2016-01-27 12:35:06-07:00