87 lines
2.4 KiB
Rust
87 lines
2.4 KiB
Rust
// Copyright 2012 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 which of the builtin types are considered POD.
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use std::rc::Rc;
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use std::gc::Gc;
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fn assert_copy<T:Copy>() { }
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trait Dummy { }
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struct MyStruct {
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x: int,
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y: int,
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}
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struct MyNoncopyStruct {
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x: Box<int>,
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}
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fn test<'a,T,U:Copy>(_: &'a int) {
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// lifetime pointers are ok...
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assert_copy::<&'static int>();
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assert_copy::<&'a int>();
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assert_copy::<&'a str>();
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assert_copy::<&'a [int]>();
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// ...unless they are mutable
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assert_copy::<&'static mut int>(); //~ ERROR does not fulfill
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assert_copy::<&'a mut int>(); //~ ERROR does not fulfill
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// ~ pointers are not ok
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assert_copy::<Box<int>>(); //~ ERROR does not fulfill
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assert_copy::<String>(); //~ ERROR does not fulfill
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assert_copy::<Vec<int> >(); //~ ERROR does not fulfill
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assert_copy::<Box<&'a mut int>>(); //~ ERROR does not fulfill
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// borrowed object types are generally ok
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assert_copy::<&'a Dummy>();
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assert_copy::<&'a Dummy+Copy>();
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assert_copy::<&'static Dummy+Copy>();
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// owned object types are not ok
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assert_copy::<Box<Dummy>>(); //~ ERROR does not fulfill
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assert_copy::<Box<Dummy+Copy>>(); //~ ERROR does not fulfill
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// mutable object types are not ok
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assert_copy::<&'a mut Dummy+Copy>(); //~ ERROR does not fulfill
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// closures are like an `&mut` object
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assert_copy::<||>(); //~ ERROR does not fulfill
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// unsafe ptrs are ok
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assert_copy::<*const int>();
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assert_copy::<*const &'a mut int>();
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// regular old ints and such are ok
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assert_copy::<int>();
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assert_copy::<bool>();
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assert_copy::<()>();
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// tuples are ok
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assert_copy::<(int,int)>();
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// structs of POD are ok
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assert_copy::<MyStruct>();
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// structs containing non-POD are not ok
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assert_copy::<MyNoncopyStruct>(); //~ ERROR does not fulfill
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// managed or ref counted types are not ok
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assert_copy::<Gc<int>>(); //~ ERROR does not fulfill
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assert_copy::<Rc<int>>(); //~ ERROR does not fulfill
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}
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pub fn main() {
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}
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