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impl const From<num> for num

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This commit is contained in:
Albin Hedman 2020-12-27 19:46:01 +01:00
parent 508b328c39
commit eefd790d3b
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GPG Key ID: 1F501ECD1BBD70A7
2 changed files with 11 additions and 5 deletions
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15
library/core/src/convert/num.rs
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@ -45,7 +45,8 @@ impl_float_to_int!(f64 => u8 u16 u32 u64 u128 usize i8 i16 i32 i64 i128 isize);
macro_rules! impl_from {
($Small: ty, $Large: ty, #[$attr:meta], $doc: expr) => {
#[$attr]
impl From<$Small> for $Large {
#[rustc_const_unstable(feature = "const_num_from_num", issue = "87852")]
impl const From<$Small> for $Large {
// Rustdocs on the impl block show a "[+] show undocumented items" toggle.
// Rustdocs on functions do not.
#[doc = $doc]
@ -172,7 +173,8 @@ impl_from! { f32, f64, #[stable(feature = "lossless_float_conv", since = "1.6.0"
macro_rules! try_from_unbounded {
($source:ty, $($target:ty),*) => {$(
#[stable(feature = "try_from", since = "1.34.0")]
impl TryFrom<$source> for $target {
#[rustc_const_unstable(feature = "const_num_from_num", issue = "87852")]
impl const TryFrom<$source> for $target {
type Error = TryFromIntError;
/// Try to create the target number type from a source
@ -190,7 +192,8 @@ macro_rules! try_from_unbounded {
macro_rules! try_from_lower_bounded {
($source:ty, $($target:ty),*) => {$(
#[stable(feature = "try_from", since = "1.34.0")]
impl TryFrom<$source> for $target {
#[rustc_const_unstable(feature = "const_num_from_num", issue = "87852")]
impl const TryFrom<$source> for $target {
type Error = TryFromIntError;
/// Try to create the target number type from a source
@ -212,7 +215,8 @@ macro_rules! try_from_lower_bounded {
macro_rules! try_from_upper_bounded {
($source:ty, $($target:ty),*) => {$(
#[stable(feature = "try_from", since = "1.34.0")]
impl TryFrom<$source> for $target {
#[rustc_const_unstable(feature = "const_num_from_num", issue = "87852")]
impl const TryFrom<$source> for $target {
type Error = TryFromIntError;
/// Try to create the target number type from a source
@ -234,7 +238,8 @@ macro_rules! try_from_upper_bounded {
macro_rules! try_from_both_bounded {
($source:ty, $($target:ty),*) => {$(
#[stable(feature = "try_from", since = "1.34.0")]
impl TryFrom<$source> for $target {
#[rustc_const_unstable(feature = "const_num_from_num", issue = "87852")]
impl const TryFrom<$source> for $target {
type Error = TryFromIntError;
/// Try to create the target number type from a source

1
library/core/src/lib.rs
View File

@ -99,6 +99,7 @@
#![feature(const_slice_from_raw_parts)]
#![feature(const_slice_ptr_len)]
#![feature(const_swap)]
#![feature(const_trait_impl)]
#![feature(const_type_id)]
#![feature(const_type_name)]
#![feature(const_unreachable_unchecked)]