exint 0.1.4

An implementation of generic signed and unsigned integers.
Documentation 
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

//! Internal Conversions
//!
//! Exists as a high-level wrapper around [`llapi::cast_bytes`].
//!
//! This is the preferred API for any type of internal integer conversion.
//!
//! [`llapi::cast_bytes`]: crate::llapi::cast_bytes

use crate::llapi::cast_bytes;
use crate::types::int;
use crate::types::uint;

// -----------------------------------------------------------------------------
// Cast
// -----------------------------------------------------------------------------

const_trait! {
  pub(crate) const trait Cast<T> {
    fn cast(self) -> T;
  }
}

// -----------------------------------------------------------------------------
// Boolean
// -----------------------------------------------------------------------------

impl<const N: usize> int<N> {
  #[inline]
  pub(crate) const fn from_bool(other: bool) -> Self {
    Self::from_u8(other as u8)
  }
}

impl<const N: usize> uint<N> {
  #[inline]
  pub(crate) const fn from_bool(other: bool) -> Self {
    Self::from_u8(other as u8)
  }
}

// -----------------------------------------------------------------------------
// Crate Types
// -----------------------------------------------------------------------------

const_trait_if! {
  #[feature("const_traits")]
  impl<const N: usize, const M: usize> const Cast<int<M>> for int<N> {
    #[inline]
    fn cast(self) -> int<M> {
      int::from_ne_bytes(cast_bytes::<false, N, M>(self.to_ne_bytes()))
    }
  }

  #[feature("const_traits")]
  impl<const N: usize, const M: usize> const Cast<uint<M>> for int<N> {
    #[inline]
    fn cast(self) -> uint<M> {
      int::<M>::cast_unsigned(Cast::cast(self))
    }
  }

  #[feature("const_traits")]
  impl<const N: usize, const M: usize> const Cast<int<M>> for uint<N> {
    #[inline]
    fn cast(self) -> int<M> {
      uint::<M>::cast_signed(Cast::cast(self))
    }
  }

  #[feature("const_traits")]
  impl<const N: usize, const M: usize> const Cast<uint<M>> for uint<N> {
    #[inline]
    fn cast(self) -> uint<M> {
      uint::from_ne_bytes(cast_bytes::<true, N, M>(self.to_ne_bytes()))
    }
  }
}

// -----------------------------------------------------------------------------
// Core Primitive Types
// -----------------------------------------------------------------------------

macro_rules! implement {
  ($type:ty, $uint:literal, $from:ident, $into:ident) => {
    const _: () = {
      const M: usize = ::core::mem::size_of::<$type>();

      impl<const N: usize> int<N> {
        #[doc(hidden)] // Only exposed for use with `int` macros and tests.
        #[inline]
        pub const fn $from(other: $type) -> Self {
          Self::from_ne_bytes(cast_bytes::<$uint, M, N>(other.to_ne_bytes()))
        }

        #[doc(hidden)] // Only exposed for use with `int` macros and tests.
        #[inline]
        pub const fn $into(self) -> $type {
          <$type>::from_ne_bytes(cast_bytes::<false, N, M>(self.to_ne_bytes()))
        }
      }

      impl<const N: usize> uint<N> {
        #[doc(hidden)] // Only exposed for use with `uint` macros and tests.
        #[inline]
        pub const fn $from(other: $type) -> Self {
          Self::from_ne_bytes(cast_bytes::<$uint, M, N>(other.to_ne_bytes()))
        }

        #[doc(hidden)] // Only exposed for use with `uint` macros and tests.
        #[inline]
        pub const fn $into(self) -> $type {
          <$type>::from_ne_bytes(cast_bytes::<true, N, M>(self.to_ne_bytes()))
        }
      }

      const_trait_if! {
        #[feature("const_traits")]
        impl<const N: usize> const Cast<$type> for int<N> {
          #[inline]
          fn cast(self) -> $type {
            int::$into(self)
          }
        }

        #[feature("const_traits")]
        impl<const N: usize> const Cast<$type> for uint<N> {
          #[inline]
          fn cast(self) -> $type {
            uint::$into(self)
          }
        }

        #[feature("const_traits")]
        impl<const N: usize> const Cast<int<N>> for $type {
          #[inline]
          fn cast(self) -> int<N> {
            int::$from(self)
          }
        }

        #[feature("const_traits")]
        impl<const N: usize> const Cast<uint<N>> for $type {
          #[inline]
          fn cast(self) -> uint<N> {
            uint::$from(self)
          }
        }
      }
    };
  };
}

implement!(u8,    true, from_u8,    into_u8);
implement!(u16,   true, from_u16,   into_u16);
implement!(u32,   true, from_u32,   into_u32);
implement!(u64,   true, from_u64,   into_u64);
implement!(u128,  true, from_u128,  into_u128);
implement!(usize, true, from_usize, into_usize);

implement!(i8,    false, from_i8,    into_i8);
implement!(i16,   false, from_i16,   into_i16);
implement!(i32,   false, from_i32,   into_i32);
implement!(i64,   false, from_i64,   into_i64);
implement!(i128,  false, from_i128,  into_i128);
implement!(isize, false, from_isize, into_isize);