mirror of
https://github.com/rust-lang/rust
synced 2024-11-05 20:45:15 +00:00
119 lines
3.2 KiB
Rust
119 lines
3.2 KiB
Rust
//@ run-pass
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// check raw fat pointer ops
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use std::mem;
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fn assert_inorder<T: PartialEq + PartialOrd>(a: &[T]) {
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for i in 0..a.len() {
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for j in 0..a.len() {
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if i < j {
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assert!(a[i] < a[j]);
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assert!(a[i] <= a[j]);
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assert!(!(a[i] == a[j]));
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assert!(a[i] != a[j]);
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assert!(!(a[i] >= a[j]));
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assert!(!(a[i] > a[j]));
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} else if i == j {
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assert!(!(a[i] < a[j]));
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assert!(a[i] <= a[j]);
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assert!(a[i] == a[j]);
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assert!(!(a[i] != a[j]));
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assert!(a[i] >= a[j]);
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assert!(!(a[i] > a[j]));
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} else {
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assert!(!(a[i] < a[j]));
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assert!(!(a[i] <= a[j]));
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assert!(!(a[i] == a[j]));
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assert!(a[i] != a[j]);
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assert!(a[i] >= a[j]);
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assert!(a[i] > a[j]);
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}
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}
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}
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}
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trait Foo { fn foo(&self) -> usize; } //~ WARN method `foo` is never used
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impl<T> Foo for T {
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fn foo(&self) -> usize {
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mem::size_of::<T>()
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}
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}
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#[allow(dead_code)]
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struct S<T:?Sized>(u32, T);
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fn main() {
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let mut array = [0,1,2,3,4];
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let mut array2 = [5,6,7,8,9];
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// fat ptr comparison: addr then extra
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// check ordering for arrays
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let mut ptrs: Vec<*const [u8]> = vec![
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&array[0..0], &array[0..1], &array, &array[1..]
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];
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let array_addr = &array as *const [u8] as *const u8 as usize;
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let array2_addr = &array2 as *const [u8] as *const u8 as usize;
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if array2_addr < array_addr {
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ptrs.insert(0, &array2);
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} else {
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ptrs.push(&array2);
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}
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assert_inorder(&ptrs);
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// check ordering for mut arrays
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let mut ptrs: Vec<*mut [u8]> = vec![
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&mut array[0..0], &mut array[0..1], &mut array, &mut array[1..]
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];
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let array_addr = &mut array as *mut [u8] as *mut u8 as usize;
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let array2_addr = &mut array2 as *mut [u8] as *mut u8 as usize;
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if array2_addr < array_addr {
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ptrs.insert(0, &mut array2);
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} else {
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ptrs.push(&mut array2);
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}
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assert_inorder(&ptrs);
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let mut u8_ = (0u8, 1u8);
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let mut u32_ = (4u32, 5u32);
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// check ordering for ptrs
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let buf: &mut [*const dyn Foo] = &mut [
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&u8_, &u8_.0,
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&u32_, &u32_.0,
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];
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buf.sort_by(|u,v| {
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let u : [*const (); 2] = unsafe { mem::transmute(*u) };
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let v : [*const (); 2] = unsafe { mem::transmute(*v) };
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u.cmp(&v)
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});
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assert_inorder(buf);
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// check ordering for mut ptrs
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let buf: &mut [*mut dyn Foo] = &mut [
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&mut u8_, &mut u8_.0,
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&mut u32_, &mut u32_.0,
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];
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buf.sort_by(|u,v| {
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let u : [*const (); 2] = unsafe { mem::transmute(*u) };
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let v : [*const (); 2] = unsafe { mem::transmute(*v) };
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u.cmp(&v)
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});
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assert_inorder(buf);
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// check ordering for structs containing arrays
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let ss: (S<[u8; 2]>,
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S<[u8; 3]>,
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S<[u8; 2]>) = (
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S(7, [8, 9]),
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S(10, [11, 12, 13]),
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S(4, [5, 6])
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);
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assert_inorder(&[
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&ss.0 as *const S<[u8]>,
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&ss.1 as *const S<[u8]>,
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&ss.2 as *const S<[u8]>
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]);
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}
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