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import core::*;
use std;
fn check_sort(v1: [int], v2: [int]) {
let len = vec::len::<int>(v1);
fn lteq(&&a: int, &&b: int) -> bool { ret a <= b; }
let f = lteq;
let v3 = std::sort::merge_sort::<int>(f, v1);
let i = 0u;
while i < len { log v3[i]; assert (v3[i] == v2[i]); i += 1u; }
}
#[test]
fn test() {
{
let v1 = [3, 7, 4, 5, 2, 9, 5, 8];
let v2 = [2, 3, 4, 5, 5, 7, 8, 9];
check_sort(v1, v2);
}
{ let v1 = [1, 1, 1]; let v2 = [1, 1, 1]; check_sort(v1, v2); }
{ let v1: [int] = []; let v2: [int] = []; check_sort(v1, v2); }
{ let v1 = [9]; let v2 = [9]; check_sort(v1, v2); }
{
let v1 = [9, 3, 3, 3, 9];
let v2 = [3, 3, 3, 9, 9];
check_sort(v1, v2);
}
}
#[test]
fn test_merge_sort_mutable() {
fn lteq(&&a: int, &&b: int) -> bool { ret a <= b; }
let v1 = [mutable 3, 2, 1];
let v2 = std::sort::merge_sort(lteq, v1);
assert v2 == [1, 2, 3];
}
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