105 lines
2.4 KiB
Zig
105 lines
2.4 KiB
Zig
pub struct List#(T: type) {
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items: ?&T,
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length: isize,
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capacity: isize,
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pub fn deinit(l: &List) {
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free(l.items);
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l.items = null;
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}
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pub fn append(l: &List, item: T) -> error {
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const err = l.ensure_capacity(l.length + 1);
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if err != error.None {
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return err;
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}
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const raw_items = l.items ?? unreachable;
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l.raw_items[l.length] = item;
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l.length += 1;
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return 0;
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}
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pub fn at(l: List, index: usize) -> T {
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assert(index < l.length);
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const raw_items = l.items ?? unreachable;
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return raw_items[index];
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}
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pub fn ptr_at(l: &List, index: usize) -> &T {
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assert(index < l.length);
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const raw_items = l.items ?? unreachable;
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return &raw_items[index];
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}
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pub fn clear(l: &List) {
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l.length = 0;
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}
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pub fn pop(l: &List) -> T {
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assert(l.length >= 1);
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l.length -= 1;
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return l.items[l.length];
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}
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fn ensure_capacity(l: &List, new_capacity: usize) -> error {
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var better_capacity = max(l.capacity, 16);
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while better_capacity < new_capacity {
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better_capacity *= 2;
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}
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if better_capacity != l.capacity {
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const new_items = realloc(l.items, better_capacity) ?? { return error.NoMem };
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l.items = new_items;
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l.capacity = better_capacity;
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}
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error.None
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}
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}
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pub fn malloc#(T: type)(count: usize) -> ?&T { realloc(None, count) }
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pub fn realloc#(T: type)(ptr: ?&T, new_count: usize) -> ?&T {
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}
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pub fn free#(T: type)(ptr: ?&T) {
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}
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////////////////// alternate
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// previously proposed, but with : instead of ->
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// `:` means "parser should expect a type now"
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fn max#(T :type)(a :T, b :T) :T {
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if (a > b) a else b
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}
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// andy's new idea
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// parameters can talk about @typeof() for previous parameters.
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// using :T here is equivalent to @child_type(@typeof(T))
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fn max(T :type, a :T, b :T) :T {
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if (a > b) a else b
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}
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fn f() {
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const x :i32 = 1234;
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const y :i32 = 5678;
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const z = max(@typeof(x), x, y);
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}
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// So, type-generic functions don't need any fancy syntax. type-generic
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// containers still do, though:
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pub struct List(T :type) {
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items :?&T,
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length :isize,
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capacity :isize,
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}
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// Types are always marked with ':' so we don't need '#' to indicate type generic parameters.
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fn f() {
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var list :List(:u8);
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}
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