module Std::Array {

extern func bux_alloc(size: uint) -> *void;
extern func bux_realloc(ptr: *void, size: uint) -> *void;
extern func bux_free(ptr: *void);
extern func bux_bounds_check(index: uint, len: uint);

struct Array {
    data: *int,
    len: uint,
    cap: uint,
}

func Array_New(cap: uint) -> Array {
    let data = bux_alloc(cap * 8) as *int;
    return Array { data: data, len: 0, cap: cap };
}

func Array_Push(arr: *Array, value: int) {
    if arr.len >= arr.cap {
        arr.cap = arr.cap * 2;
        arr.data = bux_realloc(arr.data as *void, arr.cap * 8) as *int;
    }
    arr.data[arr.len] = value;
    arr.len = arr.len + 1;
}

func Array_Get(arr: *Array, index: uint) -> int {
    bux_bounds_check(index, arr.len);
    return arr.data[index];
}

func Array_Len(arr: *Array) -> uint {
    return arr.len;
}

func Array_Free(arr: *Array) {
    bux_free(arr.data as *void);
    arr.data = null as *int;
    arr.len = 0;
    arr.cap = 0;
}

}