Files
ansi_term
anyhow
atty
bitflags
bstr
byteorder
cargo_metadata
cargo_preflight
cfg_if
clap
csv
csv_core
darling
darling_core
darling_macro
dlopen
dlopen_derive
fnv
getrandom
glob
heck
ident_case
indoc
itoa
lazy_static
lerp
lerp_derive
libc
libm
maplit
memchr
num_traits
open
pest
pest_derive
pest_generator
pest_meta
ppv_lite86
preflight
preflight_macros
proc_macro2
proc_macro_error
proc_macro_error_attr
quote
rand
rand_chacha
rand_core
regex_automata
ryu
semver
semver_parser
serde
serde_derive
serde_json
smawk
strsim
structopt
structopt_derive
syn
termcolor
textwrap
timescale
timescale_macros
typenum
ucd_trie
unicode_segmentation
unicode_width
unicode_xid
unindent
uom
uuid
vec_map
  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
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
use core::num::Wrapping;
use core::ops::Neg;

use float::FloatCore;
use Num;

/// Useful functions for signed numbers (i.e. numbers that can be negative).
pub trait Signed: Sized + Num + Neg<Output = Self> {
    /// Computes the absolute value.
    ///
    /// For `f32` and `f64`, `NaN` will be returned if the number is `NaN`.
    ///
    /// For signed integers, `::MIN` will be returned if the number is `::MIN`.
    fn abs(&self) -> Self;

    /// The positive difference of two numbers.
    ///
    /// Returns `zero` if the number is less than or equal to `other`, otherwise the difference
    /// between `self` and `other` is returned.
    fn abs_sub(&self, other: &Self) -> Self;

    /// Returns the sign of the number.
    ///
    /// For `f32` and `f64`:
    ///
    /// * `1.0` if the number is positive, `+0.0` or `INFINITY`
    /// * `-1.0` if the number is negative, `-0.0` or `NEG_INFINITY`
    /// * `NaN` if the number is `NaN`
    ///
    /// For signed integers:
    ///
    /// * `0` if the number is zero
    /// * `1` if the number is positive
    /// * `-1` if the number is negative
    fn signum(&self) -> Self;

    /// Returns true if the number is positive and false if the number is zero or negative.
    fn is_positive(&self) -> bool;

    /// Returns true if the number is negative and false if the number is zero or positive.
    fn is_negative(&self) -> bool;
}

macro_rules! signed_impl {
    ($($t:ty)*) => ($(
        impl Signed for $t {
            #[inline]
            fn abs(&self) -> $t {
                if self.is_negative() { -*self } else { *self }
            }

            #[inline]
            fn abs_sub(&self, other: &$t) -> $t {
                if *self <= *other { 0 } else { *self - *other }
            }

            #[inline]
            fn signum(&self) -> $t {
                match *self {
                    n if n > 0 => 1,
                    0 => 0,
                    _ => -1,
                }
            }

            #[inline]
            fn is_positive(&self) -> bool { *self > 0 }

            #[inline]
            fn is_negative(&self) -> bool { *self < 0 }
        }
    )*)
}

signed_impl!(isize i8 i16 i32 i64);

#[cfg(has_i128)]
signed_impl!(i128);

impl<T: Signed> Signed for Wrapping<T>
where
    Wrapping<T>: Num + Neg<Output = Wrapping<T>>,
{
    #[inline]
    fn abs(&self) -> Self {
        Wrapping(self.0.abs())
    }

    #[inline]
    fn abs_sub(&self, other: &Self) -> Self {
        Wrapping(self.0.abs_sub(&other.0))
    }

    #[inline]
    fn signum(&self) -> Self {
        Wrapping(self.0.signum())
    }

    #[inline]
    fn is_positive(&self) -> bool {
        self.0.is_positive()
    }

    #[inline]
    fn is_negative(&self) -> bool {
        self.0.is_negative()
    }
}

macro_rules! signed_float_impl {
    ($t:ty) => {
        impl Signed for $t {
            /// Computes the absolute value. Returns `NAN` if the number is `NAN`.
            #[inline]
            fn abs(&self) -> $t {
                FloatCore::abs(*self)
            }

            /// The positive difference of two numbers. Returns `0.0` if the number is
            /// less than or equal to `other`, otherwise the difference between`self`
            /// and `other` is returned.
            #[inline]
            fn abs_sub(&self, other: &$t) -> $t {
                if *self <= *other {
                    0.
                } else {
                    *self - *other
                }
            }

            /// # Returns
            ///
            /// - `1.0` if the number is positive, `+0.0` or `INFINITY`
            /// - `-1.0` if the number is negative, `-0.0` or `NEG_INFINITY`
            /// - `NAN` if the number is NaN
            #[inline]
            fn signum(&self) -> $t {
                FloatCore::signum(*self)
            }

            /// Returns `true` if the number is positive, including `+0.0` and `INFINITY`
            #[inline]
            fn is_positive(&self) -> bool {
                FloatCore::is_sign_positive(*self)
            }

            /// Returns `true` if the number is negative, including `-0.0` and `NEG_INFINITY`
            #[inline]
            fn is_negative(&self) -> bool {
                FloatCore::is_sign_negative(*self)
            }
        }
    };
}

signed_float_impl!(f32);
signed_float_impl!(f64);

/// Computes the absolute value.
///
/// For `f32` and `f64`, `NaN` will be returned if the number is `NaN`
///
/// For signed integers, `::MIN` will be returned if the number is `::MIN`.
#[inline(always)]
pub fn abs<T: Signed>(value: T) -> T {
    value.abs()
}

/// The positive difference of two numbers.
///
/// Returns zero if `x` is less than or equal to `y`, otherwise the difference
/// between `x` and `y` is returned.
#[inline(always)]
pub fn abs_sub<T: Signed>(x: T, y: T) -> T {
    x.abs_sub(&y)
}

/// Returns the sign of the number.
///
/// For `f32` and `f64`:
///
/// * `1.0` if the number is positive, `+0.0` or `INFINITY`
/// * `-1.0` if the number is negative, `-0.0` or `NEG_INFINITY`
/// * `NaN` if the number is `NaN`
///
/// For signed integers:
///
/// * `0` if the number is zero
/// * `1` if the number is positive
/// * `-1` if the number is negative
#[inline(always)]
pub fn signum<T: Signed>(value: T) -> T {
    value.signum()
}

/// A trait for values which cannot be negative
pub trait Unsigned: Num {}

macro_rules! empty_trait_impl {
    ($name:ident for $($t:ty)*) => ($(
        impl $name for $t {}
    )*)
}

empty_trait_impl!(Unsigned for usize u8 u16 u32 u64);
#[cfg(has_i128)]
empty_trait_impl!(Unsigned for u128);

impl<T: Unsigned> Unsigned for Wrapping<T> where Wrapping<T>: Num {}

#[test]
fn unsigned_wrapping_is_unsigned() {
    fn require_unsigned<T: Unsigned>(_: &T) {}
    require_unsigned(&Wrapping(42_u32));
}

// Commenting this out since it doesn't compile on Rust 1.8,
// because on this version Wrapping doesn't implement Neg and therefore can't
// implement Signed.
// #[test]
// fn signed_wrapping_is_signed() {
//     fn require_signed<T: Signed>(_: &T) {}
//     require_signed(&Wrapping(-42));
// }