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Add examples for FpCategory

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ggomez 2016-07-13 17:32:23 +02:00
parent 362b665bb2
commit 6b58baa5c8
1 changed files with 24 additions and 5 deletions
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29
src/libcore/num/mod.rs
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@ -2308,26 +2308,45 @@ impl usize {
///
/// [`f32::classify()`]: ../../std/primitive.f32.html#method.classify
/// [`f64::classify()`]: ../../std/primitive.f64.html#method.classify
///
/// # Examples
///
/// ```
/// use std::num::FpCategory;
/// use std::f32;
///
/// let num = 12.4_f32;
/// let inf = f32::INFINITY;
/// let zero = 0f32;
/// let sub: f32 = 0.000000000000000000000000000000000000011754942;
/// let nan = f32::NAN;
///
/// assert_eq!(num.classify(), FpCategory::Normal);
/// assert_eq!(inf.classify(), FpCategory::Infinite);
/// assert_eq!(zero.classify(), FpCategory::Zero);
/// assert_eq!(nan.classify(), FpCategory::Nan);
/// assert_eq!(sub.classify(), FpCategory::Subnormal);
/// ```
#[derive(Copy, Clone, PartialEq, Debug)]
#[stable(feature = "rust1", since = "1.0.0")]
pub enum FpCategory {
/// "Not a Number", often obtained by dividing by zero
/// "Not a Number", often obtained by dividing by zero.
#[stable(feature = "rust1", since = "1.0.0")]
Nan,
/// Positive or negative infinity
/// Positive or negative infinity.
#[stable(feature = "rust1", since = "1.0.0")]
Infinite ,
/// Positive or negative zero
/// Positive or negative zero.
#[stable(feature = "rust1", since = "1.0.0")]
Zero,
/// De-normalized floating point representation (less precise than `Normal`)
/// De-normalized floating point representation (less precise than `Normal`).
#[stable(feature = "rust1", since = "1.0.0")]
Subnormal,
/// A regular floating point number
/// A regular floating point number.
#[stable(feature = "rust1", since = "1.0.0")]
Normal,
}