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#![allow(dead_code)]
// Allows the macro invocation below to work
use crate as rustc_index;
rustc_macros::newtype_index! {
#[max = 0xFFFF_FFFA]
struct MyIdx {}
}
#[test]
fn index_size_is_optimized() {
use std::mem::size_of;
assert_eq!(size_of::<MyIdx>(), 4);
// Uses 0xFFFF_FFFB
assert_eq!(size_of::<Option<MyIdx>>(), 4);
// Uses 0xFFFF_FFFC
assert_eq!(size_of::<Option<Option<MyIdx>>>(), 4);
// Uses 0xFFFF_FFFD
assert_eq!(size_of::<Option<Option<Option<MyIdx>>>>(), 4);
// Uses 0xFFFF_FFFE
assert_eq!(size_of::<Option<Option<Option<Option<MyIdx>>>>>(), 4);
// Uses 0xFFFF_FFFF
assert_eq!(size_of::<Option<Option<Option<Option<Option<MyIdx>>>>>>(), 4);
// Uses a tag
assert_eq!(size_of::<Option<Option<Option<Option<Option<Option<MyIdx>>>>>>>(), 8);
}
#[test]
fn range_iterator_iterates_forwards() {
let range = MyIdx::from_u32(1)..MyIdx::from_u32(4);
assert_eq!(
range.collect::<Vec<_>>(),
[MyIdx::from_u32(1), MyIdx::from_u32(2), MyIdx::from_u32(3)]
);
}
#[test]
fn range_iterator_iterates_backwards() {
let range = MyIdx::from_u32(1)..MyIdx::from_u32(4);
assert_eq!(
range.rev().collect::<Vec<_>>(),
[MyIdx::from_u32(3), MyIdx::from_u32(2), MyIdx::from_u32(1)]
);
}
#[test]
fn range_count_is_correct() {
let range = MyIdx::from_u32(1)..MyIdx::from_u32(4);
assert_eq!(range.count(), 3);
}
#[test]
fn range_size_hint_is_correct() {
let range = MyIdx::from_u32(1)..MyIdx::from_u32(4);
assert_eq!(range.size_hint(), (3, Some(3)));
}
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