62 lines
1.4 KiB
Rust
62 lines
1.4 KiB
Rust
// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// test that ordinary fat pointer operations work.
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struct Wrapper<T: ?Sized>(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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