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https://github.com/rust-lang/rust
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71 lines
2 KiB
Rust
71 lines
2 KiB
Rust
// Test which of the builtin types are considered POD.
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use std::rc::Rc;
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fn assert_copy<T:Copy>() { }
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trait Dummy { }
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#[derive(Copy, Clone)]
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struct MyStruct {
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x: isize,
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y: isize,
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}
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struct MyNoncopyStruct {
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x: Box<char>,
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}
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fn test<'a,T,U:Copy>(_: &'a isize) {
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// lifetime pointers are ok...
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assert_copy::<&'static isize>();
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assert_copy::<&'a isize>();
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assert_copy::<&'a str>();
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assert_copy::<&'a [isize]>();
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// ...unless they are mutable
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assert_copy::<&'static mut isize>(); //~ ERROR : Copy` is not satisfied
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assert_copy::<&'a mut isize>(); //~ ERROR : Copy` is not satisfied
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// boxes are not ok
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assert_copy::<Box<isize>>(); //~ ERROR : Copy` is not satisfied
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assert_copy::<String>(); //~ ERROR : Copy` is not satisfied
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assert_copy::<Vec<isize> >(); //~ ERROR : Copy` is not satisfied
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assert_copy::<Box<&'a mut isize>>(); //~ ERROR : Copy` is not satisfied
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// borrowed object types are generally ok
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assert_copy::<&'a dyn Dummy>();
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assert_copy::<&'a (dyn Dummy + Send)>();
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assert_copy::<&'static (dyn Dummy + Send)>();
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// owned object types are not ok
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assert_copy::<Box<dyn Dummy>>(); //~ ERROR : Copy` is not satisfied
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assert_copy::<Box<dyn Dummy + Send>>(); //~ ERROR : Copy` is not satisfied
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// mutable object types are not ok
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assert_copy::<&'a mut (dyn Dummy + Send)>(); //~ ERROR : Copy` is not satisfied
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// unsafe ptrs are ok
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assert_copy::<*const isize>();
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assert_copy::<*const &'a mut isize>();
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// regular old ints and such are ok
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assert_copy::<isize>();
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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::<(isize,isize)>();
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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 : Copy` is not satisfied
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// ref counted types are not ok
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assert_copy::<Rc<isize>>(); //~ ERROR : Copy` is not satisfied
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}
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pub fn main() {
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}
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