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#![cfg_attr(not(feature = "std"), no_std)]
#![allow(dead_code)] // some code is tested for type checking only
#[cfg(not(feature = "std"))]
#[macro_use]
extern crate alloc;
#[cfg(not(feature = "std"))]
use alloc::vec::Vec;
use core::fmt::Debug;
use derive_more::IntoIterator;
#[track_caller]
fn assert_iter<T: PartialEq + Debug, I: IntoIterator<Item = T>>(iter: I, vals: &[T]) {
assert_eq!(iter.into_iter().collect::<Vec<_>>(), vals);
}
#[derive(IntoIterator)]
#[into_iterator(owned, ref, ref_mut)]
struct MyVec(Vec<i32>);
#[test]
fn tuple_single() {
let mut vals = vec![1, 2, 3];
let mut iter = MyVec(vals.clone());
assert_iter(&mut iter, &vals.iter_mut().collect::<Vec<_>>());
assert_iter(&iter, &vals.iter().collect::<Vec<_>>());
assert_iter(iter, &vals);
}
#[derive(IntoIterator)]
#[into_iterator(owned, ref, ref_mut)]
struct Numbers {
numbers: Vec<i32>,
}
#[test]
fn named_single() {
let mut vals = vec![1, 2, 3];
let mut iter = Numbers {
numbers: vals.clone(),
};
assert_iter(&mut iter, &vals.iter_mut().collect::<Vec<_>>());
assert_iter(&iter, &vals.iter().collect::<Vec<_>>());
assert_iter(iter, &vals);
}
#[derive(IntoIterator)]
struct Numbers2 {
#[into_iterator(owned, ref, ref_mut)]
numbers: Vec<i32>,
useless: bool,
useless2: bool,
}
fn named_many() {
let mut vals = vec![1, 2, 3];
let mut iter = Numbers2 {
numbers: vals.clone(),
useless: true,
useless2: true,
};
assert_iter(&mut iter, &vals.iter_mut().collect::<Vec<_>>());
assert_iter(&iter, &vals.iter().collect::<Vec<_>>());
assert_iter(iter, &vals);
}
#[derive(IntoIterator)]
struct Numbers3 {
#[into_iterator(ref, ref_mut)]
numbers: Vec<i32>,
useless: bool,
useless2: bool,
}
// Test that `owned` is not enabled when `ref`/`ref_mut` are enabled without `owned`.
impl ::core::iter::IntoIterator for Numbers3 {
type Item = <Vec<i32> as ::core::iter::IntoIterator>::Item;
type IntoIter = <Vec<i32> as ::core::iter::IntoIterator>::IntoIter;
#[inline]
fn into_iter(self) -> Self::IntoIter {
<Vec<i32> as ::core::iter::IntoIterator>::into_iter(self.numbers)
}
}
#[derive(IntoIterator)]
struct Generic1<T> {
#[into_iterator(owned, ref, ref_mut)]
items: Vec<T>,
}
#[test]
fn generic() {
let mut vals = vec![1, 2, 3];
let mut iter = Generic1 {
items: vals.clone(),
};
assert_iter(&mut iter, &vals.iter_mut().collect::<Vec<_>>());
assert_iter(&iter, &vals.iter().collect::<Vec<_>>());
assert_iter(iter, &vals);
}
#[derive(IntoIterator)]
struct Generic2<'a, T, U: Send>
where
T: Send,
{
#[into_iterator(owned, ref, ref_mut)]
items: Vec<T>,
useless: &'a U,
}
#[test]
fn generic_bounds() {
let mut vals = vec![1, 2, 3];
let useless = false;
let mut iter = Generic2 {
items: vals.clone(),
useless: &useless,
};
assert_iter(&mut iter, &vals.iter_mut().collect::<Vec<_>>());
assert_iter(&iter, &vals.iter().collect::<Vec<_>>());
assert_iter(iter, &vals);
}
#[derive(IntoIterator)]
struct Generic3<'a, 'b, T> {
#[into_iterator(owned)]
items: &'a mut Vec<&'b mut T>,
}
#[test]
fn generic_refs() {
let mut numbers = vec![1, 2, 3];
let mut numbers2 = numbers.clone();
let mut number_refs = numbers.iter_mut().collect::<Vec<_>>();
let mut number_refs2 = numbers2.iter_mut().collect::<Vec<_>>();
assert_iter(
Generic3 {
items: &mut number_refs,
},
&number_refs2.iter_mut().collect::<Vec<_>>(),
)
}
#[derive(IntoIterator)]
struct Generic4<T> {
#[into_iterator]
items: Vec<T>,
useless: bool,
}
#[test]
fn generic_owned() {
let numbers = vec![1, 2, 3];
assert_iter(
Generic4 {
items: numbers.clone(),
useless: true,
},
&numbers,
);
}
|
