1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87

use crate::{ErrorKind, Result};
use std::cmp::Ordering;
use std::fmt;

/// An floating point number that is neither infinite nor NaN.
#[derive(Debug, Default, Clone, Copy, PartialEq, PartialOrd)]
pub struct FiniteF64(f64);
impl FiniteF64 {
    /// Creates a `FiniteF64` instance without checking the value.
    ///
    /// # Safety
    ///
    /// The value must not be NaN or infinite.
    pub const unsafe fn new_unchecked(n: f64) -> Self {
        Self(n)
    }

    /// Creates a finite number.
    ///
    /// # Error
    ///
    /// If the given value is NaN or infinite, an `ErrorKind::InvalidInput` error will be returned.
    pub fn new(n: f64) -> Result<Self> {
        track_assert!(n.is_finite(), ErrorKind::InvalidInput; n);
        Ok(Self(n))
    }

    /// Returns the value as a primitive type.
    pub const fn get(self) -> f64 {
        self.0
    }
}
impl Eq for FiniteF64 {}
impl Ord for FiniteF64 {
    fn cmp(&self, other: &Self) -> Ordering {
        self.0
            .partial_cmp(&other.0)
            .unwrap_or_else(|| unreachable!())
    }
}
impl fmt::Display for FiniteF64 {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        self.0.fmt(f)
    }
}

/// An floating point number that is known not NaN.
#[derive(Debug, Default, Clone, Copy, PartialEq, PartialOrd)]
pub struct NonNanF64(f64);
impl NonNanF64 {
    /// Creates a non NaN without checking the value.
    ///
    /// # Safety
    ///
    /// The value must not be NaN.
    pub const unsafe fn new_unchecked(n: f64) -> Self {
        Self(n)
    }

    /// Creates a non NaN if the given value is not NaN.
    ///
    /// # Error
    ///
    /// If the given value is NaN, an `ErrorKind::InvalidInput` error will be returned.
    pub fn new(n: f64) -> Result<Self> {
        track_assert!(!n.is_nan(), ErrorKind::InvalidInput);
        Ok(Self(n))
    }

    /// Returns the value as a primitive type.
    pub const fn get(self) -> f64 {
        self.0
    }
}
impl Eq for NonNanF64 {}
impl Ord for NonNanF64 {
    fn cmp(&self, other: &Self) -> Ordering {
        self.0
            .partial_cmp(&other.0)
            .unwrap_or_else(|| unreachable!())
    }
}
impl fmt::Display for NonNanF64 {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        self.0.fmt(f)
    }
}