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Rollup merge of #59880 - solson:transmute-float, r=alexcrichton

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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.
This commit is contained in:
Mazdak Farrokhzad 2019-04-12 12:18:05 +02:00 • committed by GitHub
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10
src/libcore/intrinsics.rs
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@ -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.
///