114 lines
2.4 KiB
Rust
114 lines
2.4 KiB
Rust
// Copyright 2014 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 DST raw pointers
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trait Trait {
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fn foo(&self) -> isize;
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}
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struct A {
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f: isize
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}
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impl Trait for A {
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fn foo(&self) -> isize {
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self.f
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}
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}
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struct Foo<T: ?Sized> {
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f: T
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}
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pub fn main() {
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// raw trait object
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let x = A { f: 42 };
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let z: *const Trait = &x;
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let r = unsafe {
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(&*z).foo()
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};
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assert_eq!(r, 42);
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// raw DST struct
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let p = Foo {f: A { f: 42 }};
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let o: *const Foo<Trait> = &p;
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let r = unsafe {
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(&*o).f.foo()
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};
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assert_eq!(r, 42);
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// raw slice
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let a: *const [_] = &[1, 2, 3];
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unsafe {
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let b = (*a)[2];
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assert_eq!(b, 3);
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let len = (*a).len();
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assert_eq!(len, 3);
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}
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// raw slice with explicit cast
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let a = &[1, 2, 3] as *const [i32];
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unsafe {
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let b = (*a)[2];
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assert_eq!(b, 3);
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let len = (*a).len();
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assert_eq!(len, 3);
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}
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// raw DST struct with slice
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let c: *const Foo<[_]> = &Foo {f: [1, 2, 3]};
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unsafe {
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let b = (&*c).f[0];
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assert_eq!(b, 1);
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let len = (&*c).f.len();
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assert_eq!(len, 3);
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}
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// all of the above with *mut
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let mut x = A { f: 42 };
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let z: *mut Trait = &mut x;
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let r = unsafe {
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(&*z).foo()
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};
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assert_eq!(r, 42);
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let mut p = Foo {f: A { f: 42 }};
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let o: *mut Foo<Trait> = &mut p;
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let r = unsafe {
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(&*o).f.foo()
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};
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assert_eq!(r, 42);
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let a: *mut [_] = &mut [1, 2, 3];
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unsafe {
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let b = (*a)[2];
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assert_eq!(b, 3);
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let len = (*a).len();
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assert_eq!(len, 3);
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}
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let a = &mut [1, 2, 3] as *mut [i32];
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unsafe {
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let b = (*a)[2];
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assert_eq!(b, 3);
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let len = (*a).len();
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assert_eq!(len, 3);
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}
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let c: *mut Foo<[_]> = &mut Foo {f: [1, 2, 3]};
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unsafe {
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let b = (&*c).f[0];
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assert_eq!(b, 1);
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let len = (&*c).f.len();
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assert_eq!(len, 3);
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}
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}
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