53 lines
977 B
Rust
53 lines
977 B
Rust
// run-pass
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// test that ordinary fat pointer operations work.
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struct Wrapper<T: ?Sized>(#[allow(dead_code)] u32, T);
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struct FatPtrContainer<'a> {
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ptr: &'a [u8]
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}
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fn fat_ptr_project(a: &Wrapper<[u8]>) -> &[u8] {
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&a.1
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}
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fn fat_ptr_simple(a: &[u8]) -> &[u8] {
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a
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}
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fn fat_ptr_via_local(a: &[u8]) -> &[u8] {
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let x = a;
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x
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}
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fn fat_ptr_from_struct(s: FatPtrContainer) -> &[u8] {
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s.ptr
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}
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fn fat_ptr_to_struct(a: &[u8]) -> FatPtrContainer {
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FatPtrContainer { ptr: a }
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}
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fn fat_ptr_store_to<'a>(a: &'a [u8], b: &mut &'a [u8]) {
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*b = a;
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}
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fn fat_ptr_constant() -> &'static str {
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"HELLO"
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}
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fn main() {
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let a = Wrapper(4, [7,6,5]);
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let p = fat_ptr_project(&a);
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let p = fat_ptr_simple(p);
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let p = fat_ptr_via_local(p);
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let p = fat_ptr_from_struct(fat_ptr_to_struct(p));
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let mut target : &[u8] = &[42];
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fat_ptr_store_to(p, &mut target);
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assert_eq!(target, &a.1);
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assert_eq!(fat_ptr_constant(), "HELLO");
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}
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