// Copyright 2012 The Rust Project Developers. See the COPYRIGHT // file at the top-level directory of this distribution and at // http://rust-lang.org/COPYRIGHT. // // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your // option. This file may not be copied, modified, or distributed // except according to those terms. // Test which of the builtin types are considered sendable. fn assert_send<T:Send>() { } trait Dummy { } fn test<'a,T,U:Send>(_: &'a int) { // lifetime pointers with 'static lifetime are ok assert_send::<&'static int>(); assert_send::<&'static str>(); assert_send::<&'static [int]>(); // whether or not they are mutable assert_send::<&'static mut int>(); // otherwise lifetime pointers are not ok assert_send::<&'a int>(); //~ ERROR does not fulfill `Send` assert_send::<&'a str>(); //~ ERROR does not fulfill `Send` assert_send::<&'a [int]>(); //~ ERROR does not fulfill `Send` // ~ pointers are ok assert_send::<~int>(); assert_send::<~str>(); assert_send::<Vec<int> >(); // but not if they own a bad thing assert_send::<~&'a int>(); //~ ERROR does not fulfill `Send` // careful with object types, who knows what they close over... assert_send::<&'static Dummy>(); //~ ERROR does not fulfill `Send` assert_send::<&'a Dummy>(); //~ ERROR does not fulfill `Send` assert_send::<&'a Dummy:Send>(); //~ ERROR does not fulfill `Send` assert_send::<~Dummy:>(); //~ ERROR does not fulfill `Send` // ...unless they are properly bounded assert_send::<&'static Dummy:Send>(); assert_send::<~Dummy:Send>(); // but closure and object types can have lifetime bounds which make // them not ok (FIXME #5121) // assert_send::<proc:'a()>(); // ERROR does not fulfill `Send` // assert_send::<~Dummy:'a>(); // ERROR does not fulfill `Send` // unsafe ptrs are ok unless they point at unsendable things assert_send::<*int>(); assert_send::<*&'a int>(); //~ ERROR does not fulfill `Send` } fn main() { }