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Rollup merge of #50919 - frewsxcv:frewsxcv-epsilon, r=steveklabnik

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Provide more context for what the {f32,f64}::EPSILON values represent.

Introduce the 'machine epsilon' term because if one googles 'epsilon', they might stumble upon https://en.wikipedia.org/wiki/Epsilon_numbers_(mathematics) instead of https://en.wikipedia.org/wiki/Machine_epsilon
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Mark Simulacrum 2018-06-02 13:14:23 -06:00 committed by GitHub
commit 6ff9108e12
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2 changed files with 10 additions and 2 deletions
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6
src/libcore/num/f32.rs
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@ -31,7 +31,11 @@ pub const MANTISSA_DIGITS: u32 = 24;
#[stable(feature = "rust1", since = "1.0.0")]
pub const DIGITS: u32 = 6;
/// Difference between `1.0` and the next largest representable number.
/// [Machine epsilon] value for `f32`.
///
/// This is the difference between `1.0` and the next largest representable number.
///
/// [Machine epsilon]: https://en.wikipedia.org/wiki/Machine_epsilon
#[stable(feature = "rust1", since = "1.0.0")]
pub const EPSILON: f32 = 1.19209290e-07_f32;

6
src/libcore/num/f64.rs
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@ -31,7 +31,11 @@ pub const MANTISSA_DIGITS: u32 = 53;
#[stable(feature = "rust1", since = "1.0.0")]
pub const DIGITS: u32 = 15;
/// Difference between `1.0` and the next largest representable number.
/// [Machine epsilon] value for `f64`.
///
/// This is the difference between `1.0` and the next largest representable number.
///
/// [Machine epsilon]: https://en.wikipedia.org/wiki/Machine_epsilon
#[stable(feature = "rust1", since = "1.0.0")]
pub const EPSILON: f64 = 2.2204460492503131e-16_f64;