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Stabilize assoc_int_consts associated int/float constants #68952

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merged 11 commits into from
Mar 4, 2020
Merged

Stabilize assoc_int_consts associated int/float constants #68952

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271ba5a
Stabilize assoc_int_consts
faern Feb 4, 2020
3529834
Add "soft deprecation" notice to old min/max_value() docs
faern Feb 4, 2020
97bdd31
Add "soft deprecation" notice to old MIN/MAX docs
faern Feb 4, 2020
fd71fbe
Remove reference from integer docs to their modules
faern Feb 10, 2020
cf255c6
Use new preferred consts in int docs
faern Feb 4, 2020
5e17f31
Replace min/max_value() with MIN/MAX in integer docs
faern Feb 4, 2020
847a0dd
Remove uint_macros that was identical to int_macros
faern Feb 4, 2020
c67de25
Add notice about using new consts in new code on float modules
faern Feb 10, 2020
0869274
Add notice about using new consts in new code on int modules
faern Feb 4, 2020
83191c2
Update float documentation to use associated consts
faern Feb 4, 2020
b2dc618
Add usage recommendation to old float constants
faern Feb 8, 2020
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5 changes: 0 additions & 5 deletions src/libcore/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -138,7 +138,6 @@
#![feature(associated_type_bounds)]
#![feature(const_type_id)]
#![feature(const_caller_location)]
#![feature(assoc_int_consts)]
#![cfg_attr(not(bootstrap), feature(no_niche))] // rust-lang/rust#68303

#[prelude_import]
Expand All @@ -156,10 +155,6 @@ mod internal_macros;
#[macro_use]
mod int_macros;

#[path = "num/uint_macros.rs"]
#[macro_use]
mod uint_macros;

#[path = "num/i128.rs"]
pub mod i128;
#[path = "num/i16.rs"]
Expand Down
60 changes: 33 additions & 27 deletions src/libcore/num/f32.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,9 @@
//! *[See also the `f32` primitive type](../../std/primitive.f32.html).*
//!
//! Mathematically significant numbers are provided in the `consts` sub-module.
//!
//! Although using these constants won’t cause compilation warnings,
//! new code should use the associated constants directly on the primitive type.

#![stable(feature = "rust1", since = "1.0.0")]

Expand All @@ -14,17 +17,21 @@ use crate::mem;
use crate::num::FpCategory;

/// The radix or base of the internal representation of `f32`.
/// Use [`f32::RADIX`](../../std/primitive.f32.html#associatedconstant.RADIX) instead.
#[stable(feature = "rust1", since = "1.0.0")]
pub const RADIX: u32 = f32::RADIX;

/// Number of significant digits in base 2.
/// Use [`f32::MANTISSA_DIGITS`](../../std/primitive.f32.html#associatedconstant.MANTISSA_DIGITS) instead.
#[stable(feature = "rust1", since = "1.0.0")]
pub const MANTISSA_DIGITS: u32 = f32::MANTISSA_DIGITS;
/// Approximate number of significant digits in base 10.
/// Use [`f32::DIGITS`](../../std/primitive.f32.html#associatedconstant.DIGITS) instead.
#[stable(feature = "rust1", since = "1.0.0")]
pub const DIGITS: u32 = f32::DIGITS;

/// [Machine epsilon] value for `f32`.
/// Use [`f32::EPSILON`](../../std/primitive.f32.html#associatedconstant.EPSILON) instead.
///
/// This is the difference between `1.0` and the next larger representable number.
///
Expand All @@ -33,36 +40,46 @@ pub const DIGITS: u32 = f32::DIGITS;
pub const EPSILON: f32 = f32::EPSILON;

/// Smallest finite `f32` value.
/// Use [`f32::MIN`](../../std/primitive.f32.html#associatedconstant.MIN) instead.
#[stable(feature = "rust1", since = "1.0.0")]
pub const MIN: f32 = f32::MIN;
/// Smallest positive normal `f32` value.
/// Use [`f32::MIN_POSITIVE`](../../std/primitive.f32.html#associatedconstant.MIN_POSITIVE) instead.
#[stable(feature = "rust1", since = "1.0.0")]
pub const MIN_POSITIVE: f32 = f32::MIN_POSITIVE;
/// Largest finite `f32` value.
/// Use [`f32::MAX`](../../std/primitive.f32.html#associatedconstant.MAX) instead.
#[stable(feature = "rust1", since = "1.0.0")]
pub const MAX: f32 = f32::MAX;

/// One greater than the minimum possible normal power of 2 exponent.
/// Use [`f32::MIN_EXP`](../../std/primitive.f32.html#associatedconstant.MIN_EXP) instead.
#[stable(feature = "rust1", since = "1.0.0")]
pub const MIN_EXP: i32 = f32::MIN_EXP;
/// Maximum possible power of 2 exponent.
/// Use [`f32::MAX_EXP`](../../std/primitive.f32.html#associatedconstant.MAX_EXP) instead.
#[stable(feature = "rust1", since = "1.0.0")]
pub const MAX_EXP: i32 = f32::MAX_EXP;

/// Minimum possible normal power of 10 exponent.
/// Use [`f32::MIN_10_EXP`](../../std/primitive.f32.html#associatedconstant.MIN_10_EXP) instead.
#[stable(feature = "rust1", since = "1.0.0")]
pub const MIN_10_EXP: i32 = f32::MIN_10_EXP;
/// Maximum possible power of 10 exponent.
/// Use [`f32::MAX_10_EXP`](../../std/primitive.f32.html#associatedconstant.MAX_10_EXP) instead.
#[stable(feature = "rust1", since = "1.0.0")]
pub const MAX_10_EXP: i32 = f32::MAX_10_EXP;

/// Not a Number (NaN).
/// Use [`f32::NAN`](../../std/primitive.f32.html#associatedconstant.NAN) instead.
#[stable(feature = "rust1", since = "1.0.0")]
pub const NAN: f32 = f32::NAN;
/// Infinity (∞).
/// Use [`f32::INFINITY`](../../std/primitive.f32.html#associatedconstant.INFINITY) instead.
#[stable(feature = "rust1", since = "1.0.0")]
pub const INFINITY: f32 = f32::INFINITY;
/// Negative infinity (−∞).
/// Use [`f32::NEG_INFINITY`](../../std/primitive.f32.html#associatedconstant.NEG_INFINITY) instead.
#[stable(feature = "rust1", since = "1.0.0")]
pub const NEG_INFINITY: f32 = f32::NEG_INFINITY;

Expand Down Expand Up @@ -154,64 +171,62 @@ pub mod consts {
#[cfg(not(test))]
impl f32 {
/// The radix or base of the internal representation of `f32`.
#[unstable(feature = "assoc_int_consts", reason = "recently added", issue = "68490")]
#[stable(feature = "assoc_int_consts", since = "1.43.0")]
pub const RADIX: u32 = 2;

/// Number of significant digits in base 2.
#[unstable(feature = "assoc_int_consts", reason = "recently added", issue = "68490")]
#[stable(feature = "assoc_int_consts", since = "1.43.0")]
pub const MANTISSA_DIGITS: u32 = 24;

/// Approximate number of significant digits in base 10.
#[unstable(feature = "assoc_int_consts", reason = "recently added", issue = "68490")]
#[stable(feature = "assoc_int_consts", since = "1.43.0")]
pub const DIGITS: u32 = 6;

/// [Machine epsilon] value for `f32`.
///
/// This is the difference between `1.0` and the next larger representable number.
///
/// [Machine epsilon]: https://en.wikipedia.org/wiki/Machine_epsilon
#[unstable(feature = "assoc_int_consts", reason = "recently added", issue = "68490")]
#[stable(feature = "assoc_int_consts", since = "1.43.0")]
pub const EPSILON: f32 = 1.19209290e-07_f32;

/// Smallest finite `f32` value.
#[unstable(feature = "assoc_int_consts", reason = "recently added", issue = "68490")]
#[stable(feature = "assoc_int_consts", since = "1.43.0")]
pub const MIN: f32 = -3.40282347e+38_f32;
/// Smallest positive normal `f32` value.
#[unstable(feature = "assoc_int_consts", reason = "recently added", issue = "68490")]
#[stable(feature = "assoc_int_consts", since = "1.43.0")]
pub const MIN_POSITIVE: f32 = 1.17549435e-38_f32;
/// Largest finite `f32` value.
#[unstable(feature = "assoc_int_consts", reason = "recently added", issue = "68490")]
#[stable(feature = "assoc_int_consts", since = "1.43.0")]
pub const MAX: f32 = 3.40282347e+38_f32;

/// One greater than the minimum possible normal power of 2 exponent.
#[unstable(feature = "assoc_int_consts", reason = "recently added", issue = "68490")]
#[stable(feature = "assoc_int_consts", since = "1.43.0")]
pub const MIN_EXP: i32 = -125;
/// Maximum possible power of 2 exponent.
#[unstable(feature = "assoc_int_consts", reason = "recently added", issue = "68490")]
#[stable(feature = "assoc_int_consts", since = "1.43.0")]
pub const MAX_EXP: i32 = 128;

/// Minimum possible normal power of 10 exponent.
#[unstable(feature = "assoc_int_consts", reason = "recently added", issue = "68490")]
#[stable(feature = "assoc_int_consts", since = "1.43.0")]
pub const MIN_10_EXP: i32 = -37;
/// Maximum possible power of 10 exponent.
#[unstable(feature = "assoc_int_consts", reason = "recently added", issue = "68490")]
#[stable(feature = "assoc_int_consts", since = "1.43.0")]
pub const MAX_10_EXP: i32 = 38;

/// Not a Number (NaN).
#[unstable(feature = "assoc_int_consts", reason = "recently added", issue = "68490")]
#[stable(feature = "assoc_int_consts", since = "1.43.0")]
pub const NAN: f32 = 0.0_f32 / 0.0_f32;
/// Infinity (∞).
#[unstable(feature = "assoc_int_consts", reason = "recently added", issue = "68490")]
#[stable(feature = "assoc_int_consts", since = "1.43.0")]
pub const INFINITY: f32 = 1.0_f32 / 0.0_f32;
/// Negative infinity (-∞).
#[unstable(feature = "assoc_int_consts", reason = "recently added", issue = "68490")]
#[stable(feature = "assoc_int_consts", since = "1.43.0")]
pub const NEG_INFINITY: f32 = -1.0_f32 / 0.0_f32;

/// Returns `true` if this value is `NaN`.
///
/// ```
/// use std::f32;
///
/// let nan = f32::NAN;
/// let f = 7.0_f32;
///
Expand All @@ -236,8 +251,6 @@ impl f32 {
/// `false` otherwise.
///
/// ```
/// use std::f32;
///
/// let f = 7.0f32;
/// let inf = f32::INFINITY;
/// let neg_inf = f32::NEG_INFINITY;
Expand All @@ -258,8 +271,6 @@ impl f32 {
/// Returns `true` if this number is neither infinite nor `NaN`.
///
/// ```
/// use std::f32;
///
/// let f = 7.0f32;
/// let inf = f32::INFINITY;
/// let neg_inf = f32::NEG_INFINITY;
Expand All @@ -283,8 +294,6 @@ impl f32 {
/// [subnormal], or `NaN`.
///
/// ```
/// use std::f32;
///
/// let min = f32::MIN_POSITIVE; // 1.17549435e-38f32
/// let max = f32::MAX;
/// let lower_than_min = 1.0e-40_f32;
Expand Down Expand Up @@ -312,7 +321,6 @@ impl f32 {
///
/// ```
/// use std::num::FpCategory;
/// use std::f32;
///
/// let num = 12.4_f32;
/// let inf = f32::INFINITY;
Expand Down Expand Up @@ -372,8 +380,6 @@ impl f32 {
/// Takes the reciprocal (inverse) of a number, `1/x`.
///
/// ```
/// use std::f32;
///
/// let x = 2.0_f32;
/// let abs_difference = (x.recip() - (1.0 / x)).abs();
///
Expand All @@ -388,7 +394,7 @@ impl f32 {
/// Converts radians to degrees.
///
/// ```
/// use std::f32::{self, consts};
/// use std::f32::consts;
///
/// let angle = consts::PI;
///
Expand All @@ -407,7 +413,7 @@ impl f32 {
/// Converts degrees to radians.
///
/// ```
/// use std::f32::{self, consts};
/// use std::f32::consts;
///
/// let angle = 180.0f32;
///
Expand Down
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