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| author | Mazdak Farrokhzad <twingoow@gmail.com> | 2019-04-12 12:18:05 +0200 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2019-04-12 12:18:05 +0200 |
| commit | 257dbb826d0000f7d56c71fb7d93b5de288a157e (patch) | |
| tree | d4c591fdb739d03c8267cf52991a7978f67bf3d2 | |
| parent | ef90d940dc6169c1d505ec5d30d5ad0cab189ccc (diff) | |
| parent | f54df449072895f258876adf9545fe3a0840492f (diff) | |
Rollup merge of #59880 - solson:transmute-float, r=alexcrichton
Remove note about transmute for float bitpatterns. This particular usecase has been safely abstracted in these `std` functions: [f32::to_bits](https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits), [f32::from_bits](https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits), [f64::to_bits](https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits), [f64::from_bits](https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits). So, I think we shouldn't recommend an unnecessary use of `unsafe` here anymore.
| -rw-r--r-- | src/libcore/intrinsics.rs | 10 |
1 files changed, 0 insertions, 10 deletions
diff --git a/src/libcore/intrinsics.rs b/src/libcore/intrinsics.rs index 75a33394e3d..05acd7bd011 100644 --- a/src/libcore/intrinsics.rs +++ b/src/libcore/intrinsics.rs @@ -737,16 +737,6 @@ extern "rust-intrinsic" { /// /// There are a few things that `transmute` is really useful for. /// - /// Getting the bitpattern of a floating point type (or, more generally, - /// type punning, when `T` and `U` aren't pointers): - /// - /// ``` - /// let bitpattern = unsafe { - /// std::mem::transmute::<f32, u32>(1.0) - /// }; - /// assert_eq!(bitpattern, 0x3F800000); - /// ``` - /// /// Turning a pointer into a function pointer. This is *not* portable to /// machines where function pointers and data pointers have different sizes. /// |