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| author | Niko Matsakis <niko@alum.mit.edu> | 2014-12-05 17:01:33 -0800 |
|---|---|---|
| committer | Niko Matsakis <niko@alum.mit.edu> | 2014-12-08 13:47:44 -0500 |
| commit | 096a28607fb80c91e6e2ca64d9ef44c4e550e96c (patch) | |
| tree | 82c4ee8f20df133305959d507ec76adb4db5e324 /src/libcore/simd.rs | |
| parent | c7a9b49d1b5d4e520f25355f26a93dfac4ffa146 (diff) | |
| download | rust-096a28607fb80c91e6e2ca64d9ef44c4e550e96c.tar.gz rust-096a28607fb80c91e6e2ca64d9ef44c4e550e96c.zip | |
librustc: Make `Copy` opt-in.
This change makes the compiler no longer infer whether types (structures
and enumerations) implement the `Copy` trait (and thus are implicitly
copyable). Rather, you must implement `Copy` yourself via `impl Copy for
MyType {}`.
A new warning has been added, `missing_copy_implementations`, to warn
you if a non-generic public type has been added that could have
implemented `Copy` but didn't.
For convenience, you may *temporarily* opt out of this behavior by using
`#![feature(opt_out_copy)]`. Note though that this feature gate will never be
accepted and will be removed by the time that 1.0 is released, so you should
transition your code away from using it.
This breaks code like:
#[deriving(Show)]
struct Point2D {
x: int,
y: int,
}
fn main() {
let mypoint = Point2D {
x: 1,
y: 1,
};
let otherpoint = mypoint;
println!("{}{}", mypoint, otherpoint);
}
Change this code to:
#[deriving(Show)]
struct Point2D {
x: int,
y: int,
}
impl Copy for Point2D {}
fn main() {
let mypoint = Point2D {
x: 1,
y: 1,
};
let otherpoint = mypoint;
println!("{}{}", mypoint, otherpoint);
}
This is the backwards-incompatible part of #13231.
Part of RFC #3.
[breaking-change]
Diffstat (limited to 'src/libcore/simd.rs')
| -rw-r--r-- | src/libcore/simd.rs | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/src/libcore/simd.rs b/src/libcore/simd.rs index 2b6f97cf6a5..369a7106583 100644 --- a/src/libcore/simd.rs +++ b/src/libcore/simd.rs @@ -37,6 +37,8 @@ #![allow(non_camel_case_types)] #![allow(missing_docs)] +use kinds::Copy; + #[experimental] #[simd] #[deriving(Show)] @@ -46,6 +48,8 @@ pub struct i8x16(pub i8, pub i8, pub i8, pub i8, pub i8, pub i8, pub i8, pub i8, pub i8, pub i8, pub i8, pub i8); +impl Copy for i8x16 {} + #[experimental] #[simd] #[deriving(Show)] @@ -53,18 +57,24 @@ pub struct i8x16(pub i8, pub i8, pub i8, pub i8, pub struct i16x8(pub i16, pub i16, pub i16, pub i16, pub i16, pub i16, pub i16, pub i16); +impl Copy for i16x8 {} + #[experimental] #[simd] #[deriving(Show)] #[repr(C)] pub struct i32x4(pub i32, pub i32, pub i32, pub i32); +impl Copy for i32x4 {} + #[experimental] #[simd] #[deriving(Show)] #[repr(C)] pub struct i64x2(pub i64, pub i64); +impl Copy for i64x2 {} + #[experimental] #[simd] #[deriving(Show)] @@ -74,6 +84,8 @@ pub struct u8x16(pub u8, pub u8, pub u8, pub u8, pub u8, pub u8, pub u8, pub u8, pub u8, pub u8, pub u8, pub u8); +impl Copy for u8x16 {} + #[experimental] #[simd] #[deriving(Show)] @@ -81,26 +93,37 @@ pub struct u8x16(pub u8, pub u8, pub u8, pub u8, pub struct u16x8(pub u16, pub u16, pub u16, pub u16, pub u16, pub u16, pub u16, pub u16); +impl Copy for u16x8 {} + #[experimental] #[simd] #[deriving(Show)] #[repr(C)] pub struct u32x4(pub u32, pub u32, pub u32, pub u32); +impl Copy for u32x4 {} + #[experimental] #[simd] #[deriving(Show)] #[repr(C)] pub struct u64x2(pub u64, pub u64); +impl Copy for u64x2 {} + #[experimental] #[simd] #[deriving(Show)] #[repr(C)] pub struct f32x4(pub f32, pub f32, pub f32, pub f32); +impl Copy for f32x4 {} + #[experimental] #[simd] #[deriving(Show)] #[repr(C)] pub struct f64x2(pub f64, pub f64); + +impl Copy for f64x2 {} + |