42 lines
832 B
Rust
42 lines
832 B
Rust
// run-pass
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#![feature(raw)]
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use std::mem;
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use std::raw;
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trait Foo {
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fn foo(&self) {}
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}
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struct Bar;
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impl Foo for Bar {}
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fn main() {
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// Test we can turn a fat pointer to array back into a thin pointer.
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let a: *const [i32] = &[1, 2, 3];
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let b = a as *const [i32; 2];
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unsafe {
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assert_eq!(*b, [1, 2]);
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}
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// Test conversion to an address (usize).
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let a: *const [i32; 3] = &[1, 2, 3];
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let b: *const [i32] = a;
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assert_eq!(a as usize, b as *const () as usize);
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// And conversion to a void pointer/address for trait objects too.
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let a: *mut dyn Foo = &mut Bar;
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let b = a as *mut ();
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let c = a as *const () as usize;
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let d = unsafe {
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let r: raw::TraitObject = mem::transmute(a);
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r.data
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};
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assert_eq!(b, d);
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assert_eq!(c, d as usize);
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}
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