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| author | bors <bors@rust-lang.org> | 2022-12-21 14:27:57 +0000 |
|---|---|---|
| committer | bors <bors@rust-lang.org> | 2022-12-21 14:27:57 +0000 |
| commit | 49143814e145c711e9807fac6467c14090663796 (patch) | |
| tree | 6150bfe7e4adf1ed094791edad23f37119523259 | |
| parent | 1d12c3cea30b8ba4a09650a9e9c46fe9fbe25f0b (diff) | |
| parent | b134d1108ffc92bfb5081d31e5e41141f918e942 (diff) | |
| download | rust-49143814e145c711e9807fac6467c14090663796.tar.gz rust-49143814e145c711e9807fac6467c14090663796.zip | |
Auto merge of #100390 - jhpratt:float-from-bool, r=dtolnay
Implement `From<bool>` for f32, f64 As is required for trait implementations, these are insta-stable. Given there is a release tomorrow and this needs FCP, I set 1.65 as the stable version. `@rustbot` label +A-floating-point +C-feature-request +needs-fcp +relnotes +S-waiting-on-review +T-libs-api -T-libs
| -rw-r--r-- | library/core/src/convert/num.rs | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/library/core/src/convert/num.rs b/library/core/src/convert/num.rs index 9c0d7e9a1e8..45e2f711c6c 100644 --- a/library/core/src/convert/num.rs +++ b/library/core/src/convert/num.rs @@ -168,6 +168,26 @@ impl_from! { u32, f64, #[stable(feature = "lossless_float_conv", since = "1.6.0" // Float -> Float impl_from! { f32, f64, #[stable(feature = "lossless_float_conv", since = "1.6.0")] } +// bool -> Float +#[stable(feature = "float_from_bool", since = "CURRENT_RUSTC_VERSION")] +#[rustc_const_unstable(feature = "const_num_from_num", issue = "87852")] +impl const From<bool> for f32 { + /// Converts `bool` to `f32` losslessly. + #[inline] + fn from(small: bool) -> Self { + small as u8 as Self + } +} +#[stable(feature = "float_from_bool", since = "CURRENT_RUSTC_VERSION")] +#[rustc_const_unstable(feature = "const_num_from_num", issue = "87852")] +impl const From<bool> for f64 { + /// Converts `bool` to `f64` losslessly. + #[inline] + fn from(small: bool) -> Self { + small as u8 as Self + } +} + // no possible bounds violation macro_rules! try_from_unbounded { ($source:ty, $($target:ty),*) => {$( |