src/test/compile-fail/kindck-copy.rs

   1 // Copyright 2012 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 // Test which of the builtin types are considered POD.
  12
  13 use std::rc::Rc;
  14
  15 fn assert_copy<T:Copy>() { }
  16
  17 trait Dummy { }
  18
  19 #[derive(Copy, Clone)]
  20 struct MyStruct {
  21     x: isize,
  22     y: isize,
  23 }
  24
  25 struct MyNoncopyStruct {
  26     x: Box<char>,
  27 }
  28
  29 fn test<'a,T,U:Copy>(_: &'a isize) {
  30     // lifetime pointers are ok...
  31     assert_copy::<&'static isize>();
  32     assert_copy::<&'a isize>();
  33     assert_copy::<&'a str>();
  34     assert_copy::<&'a [isize]>();
  35
  36     // ...unless they are mutable
  37     assert_copy::<&'static mut isize>(); //~ ERROR : std::marker::Copy` is not satisfied
  38     assert_copy::<&'a mut isize>();  //~ ERROR : std::marker::Copy` is not satisfied
  39
  40     // boxes are not ok
  41     assert_copy::<Box<isize>>();   //~ ERROR : std::marker::Copy` is not satisfied
  42     assert_copy::<String>();   //~ ERROR : std::marker::Copy` is not satisfied
  43     assert_copy::<Vec<isize> >(); //~ ERROR : std::marker::Copy` is not satisfied
  44     assert_copy::<Box<&'a mut isize>>(); //~ ERROR : std::marker::Copy` is not satisfied
  45
  46     // borrowed object types are generally ok
  47     assert_copy::<&'a Dummy>();
  48     assert_copy::<&'a (Dummy+Copy)>();
  49     assert_copy::<&'static (Dummy+Copy)>();
  50
  51     // owned object types are not ok
  52     assert_copy::<Box<Dummy>>(); //~ ERROR : std::marker::Copy` is not satisfied
  53     assert_copy::<Box<Dummy+Copy>>(); //~ ERROR : std::marker::Copy` is not satisfied
  54
  55     // mutable object types are not ok
  56     assert_copy::<&'a mut (Dummy+Copy)>();  //~ ERROR : std::marker::Copy` is not satisfied
  57
  58     // unsafe ptrs are ok
  59     assert_copy::<*const isize>();
  60     assert_copy::<*const &'a mut isize>();
  61
  62     // regular old ints and such are ok
  63     assert_copy::<isize>();
  64     assert_copy::<bool>();
  65     assert_copy::<()>();
  66
  67     // tuples are ok
  68     assert_copy::<(isize,isize)>();
  69
  70     // structs of POD are ok
  71     assert_copy::<MyStruct>();
  72
  73     // structs containing non-POD are not ok
  74     assert_copy::<MyNoncopyStruct>(); //~ ERROR : std::marker::Copy` is not satisfied
  75
  76     // ref counted types are not ok
  77     assert_copy::<Rc<isize>>();   //~ ERROR : std::marker::Copy` is not satisfied
  78 }
  79
  80 pub fn main() {
  81 }