68 lines
1.5 KiB
Plaintext
68 lines
1.5 KiB
Plaintext
import "@std/mem"
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ArrayList func($T type) type {
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return struct {
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items []mut T
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capacity usize
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allocator mem.Allocator
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}
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}
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init func($T type, allocator mem.Allocator) ArrayList(T) {
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return ArrayList(T) {
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items = mem.empty(T),
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capacity = 0,
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allocator = allocator,
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}
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}
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deinit func($T type, list @mut ArrayList(T)) void {
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allocation []mut T :: list.items.ptr[..list.capacity]
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mem.free(list.allocator, allocation)
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list.items = mem.empty(T)
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list.capacity = 0
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}
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reserve func($T type, list @mut ArrayList(T), minimum_capacity usize) void ! mem.AllocError {
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if minimum_capacity <= list.capacity {
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return
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}
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new_capacity usize = 8
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if list.capacity >= 8 {
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half usize :: divtrunc!(list.capacity, 2)
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if list.capacity > maxval!(usize) - half {
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new_capacity = minimum_capacity
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} else {
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new_capacity = list.capacity + half
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}
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}
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if new_capacity < minimum_capacity {
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new_capacity = minimum_capacity
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}
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length usize :: list.items.len
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allocation []mut T :: list.items.ptr[..list.capacity]
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grown []mut T :: mem.realloc(list.allocator, allocation, new_capacity) catch |_| {
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return .out_of_memory
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}
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list.items = grown.ptr[..length]
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list.capacity = new_capacity
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return
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}
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append func($T type, list @mut ArrayList(T), value T) void ! mem.AllocError {
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length usize :: list.items.len
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if length == maxval!(usize) {
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return .out_of_memory
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}
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try reserve(list, length + 1)
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list.items = list.items.ptr[..length + 1]
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list.items[length] = value
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return
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}
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clear func($T type, list @mut ArrayList(T)) void {
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list.items = list.items.ptr[..0]
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}
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