Chih-Hung Hsieh | 6f3e927 | 2020-05-13 16:08:03 -0700 | [diff] [blame] | 1 | // Original code (./enum-default.rs): |
| 2 | // |
| 3 | // ```rust |
| 4 | // #![allow(dead_code)] |
| 5 | // |
| 6 | // use pin_project::pin_project; |
| 7 | // |
Haibo Huang | 2960bb3 | 2020-05-18 15:51:06 -0700 | [diff] [blame] | 8 | // #[pin_project(project = EnumProj)] |
Chih-Hung Hsieh | 6f3e927 | 2020-05-13 16:08:03 -0700 | [diff] [blame] | 9 | // enum Enum<T, U> { |
| 10 | // Pinned(#[pin] T), |
| 11 | // Unpinned(U), |
| 12 | // } |
| 13 | // |
| 14 | // fn main() {} |
| 15 | // ``` |
| 16 | |
Chih-Hung Hsieh | 127364b | 2020-10-26 16:54:29 -0700 | [diff] [blame] | 17 | #![allow(dead_code, unused_imports, unused_parens, unknown_lints, renamed_and_removed_lints)] |
Joel Galenson | c1569cc | 2021-08-09 10:36:36 -0700 | [diff] [blame] | 18 | #![allow( |
| 19 | clippy::needless_lifetimes, |
| 20 | clippy::just_underscores_and_digits, |
| 21 | clippy::used_underscore_binding |
| 22 | )] |
Chih-Hung Hsieh | 6f3e927 | 2020-05-13 16:08:03 -0700 | [diff] [blame] | 23 | |
| 24 | use pin_project::pin_project; |
| 25 | |
Chih-Hung Hsieh | 127364b | 2020-10-26 16:54:29 -0700 | [diff] [blame] | 26 | // #[pin_project(project = EnumProj)] |
Chih-Hung Hsieh | 6f3e927 | 2020-05-13 16:08:03 -0700 | [diff] [blame] | 27 | enum Enum<T, U> { |
| 28 | Pinned(/* #[pin] */ T), |
| 29 | Unpinned(U), |
| 30 | } |
| 31 | |
Haibo Huang | 2960bb3 | 2020-05-18 15:51:06 -0700 | [diff] [blame] | 32 | enum EnumProj<'pin, T, U> |
Chih-Hung Hsieh | 6f3e927 | 2020-05-13 16:08:03 -0700 | [diff] [blame] | 33 | where |
| 34 | Enum<T, U>: 'pin, |
| 35 | { |
Haibo Huang | d58366d | 2020-07-10 20:23:30 -0700 | [diff] [blame] | 36 | Pinned(::pin_project::__private::Pin<&'pin mut (T)>), |
Chih-Hung Hsieh | 6f3e927 | 2020-05-13 16:08:03 -0700 | [diff] [blame] | 37 | Unpinned(&'pin mut (U)), |
| 38 | } |
Chih-Hung Hsieh | 6f3e927 | 2020-05-13 16:08:03 -0700 | [diff] [blame] | 39 | |
Haibo Huang | d58366d | 2020-07-10 20:23:30 -0700 | [diff] [blame] | 40 | const _: () = { |
Chih-Hung Hsieh | 127364b | 2020-10-26 16:54:29 -0700 | [diff] [blame] | 41 | // When `#[pin_project]` is used on enums, only named projection types and |
| 42 | // methods are generated because there is no way to access variants of |
| 43 | // projected types without naming it. |
| 44 | // (When `#[pin_project]` is used on structs, both methods are always generated.) |
| 45 | |
Chih-Hung Hsieh | 6f3e927 | 2020-05-13 16:08:03 -0700 | [diff] [blame] | 46 | impl<T, U> Enum<T, U> { |
| 47 | fn project<'pin>( |
Haibo Huang | d58366d | 2020-07-10 20:23:30 -0700 | [diff] [blame] | 48 | self: ::pin_project::__private::Pin<&'pin mut Self>, |
Haibo Huang | 2960bb3 | 2020-05-18 15:51:06 -0700 | [diff] [blame] | 49 | ) -> EnumProj<'pin, T, U> { |
Chih-Hung Hsieh | 6f3e927 | 2020-05-13 16:08:03 -0700 | [diff] [blame] | 50 | unsafe { |
| 51 | match self.get_unchecked_mut() { |
Haibo Huang | 6c94c6b | 2020-11-18 15:37:31 -0800 | [diff] [blame] | 52 | Self::Pinned(_0) => { |
Haibo Huang | d58366d | 2020-07-10 20:23:30 -0700 | [diff] [blame] | 53 | EnumProj::Pinned(::pin_project::__private::Pin::new_unchecked(_0)) |
Haibo Huang | 2960bb3 | 2020-05-18 15:51:06 -0700 | [diff] [blame] | 54 | } |
Haibo Huang | 6c94c6b | 2020-11-18 15:37:31 -0800 | [diff] [blame] | 55 | Self::Unpinned(_0) => EnumProj::Unpinned(_0), |
Chih-Hung Hsieh | 6f3e927 | 2020-05-13 16:08:03 -0700 | [diff] [blame] | 56 | } |
| 57 | } |
| 58 | } |
Chih-Hung Hsieh | 6f3e927 | 2020-05-13 16:08:03 -0700 | [diff] [blame] | 59 | } |
| 60 | |
| 61 | // Automatically create the appropriate conditional `Unpin` implementation. |
| 62 | // |
| 63 | // See ./struct-default-expanded.rs and https://github.com/taiki-e/pin-project/pull/53. |
| 64 | // for details. |
| 65 | struct __Enum<'pin, T, U> { |
Haibo Huang | c9e4456 | 2020-07-27 09:15:10 -0700 | [diff] [blame] | 66 | __pin_project_use_generics: ::pin_project::__private::AlwaysUnpin< |
| 67 | 'pin, |
| 68 | (::pin_project::__private::PhantomData<T>, ::pin_project::__private::PhantomData<U>), |
| 69 | >, |
Chih-Hung Hsieh | 6f3e927 | 2020-05-13 16:08:03 -0700 | [diff] [blame] | 70 | __field0: T, |
| 71 | } |
Haibo Huang | d58366d | 2020-07-10 20:23:30 -0700 | [diff] [blame] | 72 | impl<'pin, T, U> ::pin_project::__private::Unpin for Enum<T, U> where |
| 73 | __Enum<'pin, T, U>: ::pin_project::__private::Unpin |
Chih-Hung Hsieh | 6f3e927 | 2020-05-13 16:08:03 -0700 | [diff] [blame] | 74 | { |
| 75 | } |
Chih-Hung Hsieh | 127364b | 2020-10-26 16:54:29 -0700 | [diff] [blame] | 76 | // A dummy impl of `UnsafeUnpin`, to ensure that the user cannot implement it. |
| 77 | #[doc(hidden)] |
| 78 | unsafe impl<'pin, T, U> ::pin_project::UnsafeUnpin for Enum<T, U> where |
| 79 | __Enum<'pin, T, U>: ::pin_project::__private::Unpin |
| 80 | { |
| 81 | } |
Chih-Hung Hsieh | 6f3e927 | 2020-05-13 16:08:03 -0700 | [diff] [blame] | 82 | |
| 83 | // Ensure that enum does not implement `Drop`. |
| 84 | // |
| 85 | // See ./struct-default-expanded.rs for details. |
| 86 | trait EnumMustNotImplDrop {} |
Chih-Hung Hsieh | 127364b | 2020-10-26 16:54:29 -0700 | [diff] [blame] | 87 | #[allow(clippy::drop_bounds, drop_bounds)] |
Haibo Huang | d58366d | 2020-07-10 20:23:30 -0700 | [diff] [blame] | 88 | impl<T: ::pin_project::__private::Drop> EnumMustNotImplDrop for T {} |
Chih-Hung Hsieh | 6f3e927 | 2020-05-13 16:08:03 -0700 | [diff] [blame] | 89 | impl<T, U> EnumMustNotImplDrop for Enum<T, U> {} |
Chih-Hung Hsieh | 127364b | 2020-10-26 16:54:29 -0700 | [diff] [blame] | 90 | // A dummy impl of `PinnedDrop`, to ensure that users don't accidentally |
| 91 | // write a non-functional `PinnedDrop` impls. |
| 92 | #[doc(hidden)] |
Chih-Hung Hsieh | 6f3e927 | 2020-05-13 16:08:03 -0700 | [diff] [blame] | 93 | impl<T, U> ::pin_project::__private::PinnedDrop for Enum<T, U> { |
Haibo Huang | d58366d | 2020-07-10 20:23:30 -0700 | [diff] [blame] | 94 | unsafe fn drop(self: ::pin_project::__private::Pin<&mut Self>) {} |
Chih-Hung Hsieh | 6f3e927 | 2020-05-13 16:08:03 -0700 | [diff] [blame] | 95 | } |
| 96 | |
| 97 | // We don't need to check for `#[repr(packed)]`, |
| 98 | // since it does not apply to enums. |
| 99 | }; |
| 100 | |
| 101 | fn main() {} |