pub enum FpCategory {
Nan,
Infinite,
Zero,
Subnormal,
Normal,
}
Expand description
A classification of floating point numbers.
This enum
is used as the return type for f32::classify
and f64::classify
. See
their documentation for more.
§Examples
use std::num::FpCategory;
let num = 12.4_f32;
let inf = f32::INFINITY;
let zero = 0f32;
let sub: f32 = 1.1754942e-38;
let nan = f32::NAN;
assert_eq!(num.classify(), FpCategory::Normal);
assert_eq!(inf.classify(), FpCategory::Infinite);
assert_eq!(zero.classify(), FpCategory::Zero);
assert_eq!(sub.classify(), FpCategory::Subnormal);
assert_eq!(nan.classify(), FpCategory::Nan);
Variants§
Nan
NaN (not a number): this value results from calculations like (-1.0).sqrt()
.
See the documentation for f32
for more information on the unusual properties
of NaN.
Infinite
Positive or negative infinity, which often results from dividing a nonzero number by zero.
Zero
Positive or negative zero.
See the documentation for f32
for more information on the signedness of zeroes.
Subnormal
“Subnormal” or “denormal” floating point representation (less precise, relative to
their magnitude, than Normal
).
Subnormal numbers are larger in magnitude than Zero
but smaller in magnitude than all
Normal
numbers.
Normal
A regular floating point number, not any of the exceptional categories.
The smallest positive normal numbers are f32::MIN_POSITIVE
and f64::MIN_POSITIVE
,
and the largest positive normal numbers are f32::MAX
and f64::MAX
. (Unlike signed
integers, floating point numbers are symmetric in their range, so negating any of these
constants will produce their negative counterpart.)
Trait Implementations§
1.6.0 · source§impl Clone for FpCategory
impl Clone for FpCategory
source§fn clone(&self) -> FpCategory
fn clone(&self) -> FpCategory
1.6.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read more