twibint 0.3.2

Crate for arithmetic on arbitrarily large integers. Provides Python bindings as well.
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

use crate::traits::Digit;
use crate::BigInt;
use crate::BigUint;
use std::ops::BitAnd;
use std::ops::BitAndAssign;
use std::ops::BitOr;
use std::ops::BitOrAssign;
use std::ops::BitXor;
use std::ops::BitXorAssign;
use std::ops::Div;
use std::ops::DivAssign;
use std::ops::Mul;
use std::ops::MulAssign;
use std::ops::Rem;
use std::ops::RemAssign;
use std::ops::Sub;
use std::ops::SubAssign;
use typed_test_gen::test_with;

use std::ops::Add;
use std::ops::AddAssign;

macro_rules! op_bound_def {
    ($trait_name: ident, $op: ident) => {
        #[allow(unused)]
        trait $trait_name<T: Digit>
        where
            Self: $op<T>,
            Self: $op<Self::Value>,
            Self: for<'a> $op<&'a T>,
            Self: for<'a> $op<&'a Self::Value>,
        {
            type Value;
        }
    };
}

macro_rules! op_bound_implem {
    ($trait_name: ident, $type: ident) => {
        impl<T: Digit> $trait_name<T> for $type<T> {
            type Value = $type<T>;
        }
    };
}
macro_rules! op_bound_ref_implem {
    ($trait_name: ident, $type: ident) => {
        impl<'a, T: Digit> $trait_name<T> for &'a $type<T> {
            type Value = $type<T>;
        }
    };
}
macro_rules! op_bound {
    (($trait_name: ident, $op_name: ident, $fun: ident), ($traitassign_name: ident, $opassign_name: ident, $funassign: ident)) => {
        op_bound_def!($trait_name, $op_name);
        op_bound_def!($traitassign_name, $opassign_name);
        op_bound_implem!($traitassign_name, BigUint);
        op_bound_implem!($trait_name, BigUint);
        op_bound_ref_implem!($trait_name, BigUint);
        op_bound_implem!($traitassign_name, BigInt);
        op_bound_implem!($trait_name, BigInt);
        op_bound_ref_implem!($trait_name, BigInt);

        /// This tests every combination of refrence/values for pairs of argument,
        /// and checks that the answer is always the same (doesn't check the value)
        #[test_with(u32, u64)]
        fn $fun<T: Digit>() {
            let a = BigUint::<T>::from(vec![T::MAX, T::MAX, T::MAX]);
            let b = BigUint::<T>::new(T::MAX);
            let literal = T::MAX;

            let mut results = vec![];
            results.push($op_name::$fun(&a, &b));
            results.push($op_name::$fun(&a, b.clone()));
            results.push($op_name::$fun(a.clone(), &b));
            results.push($op_name::$fun(a.clone(), b.clone()));
            results.push($op_name::$fun(&a, &literal));
            results.push($op_name::$fun(&a, literal.clone()));
            results.push($op_name::$fun(a.clone(), &literal));
            results.push($op_name::$fun(a.clone(), literal.clone()));

            let mut n = a.clone();
            $opassign_name::$funassign(&mut n, &b);
            results.push(n);
            let mut n = a.clone();
            $opassign_name::$funassign(&mut n, b);
            results.push(n);
            let mut n = a.clone();
            $opassign_name::$funassign(&mut n, &literal);
            results.push(n);
            let mut n = a.clone();
            $opassign_name::$funassign(&mut n, literal);
            results.push(n);

            for i in 1..results.len() {
                assert_eq!(results[0], results[i]);
            }

            let a = BigInt::<T>::from(vec![T::MAX, T::MAX, T::MAX]);
            let b = BigInt::<T>::from_unsigned(T::MAX);
            let literal = T::MAX;

            let mut results = vec![];
            results.push($op_name::$fun(&a, &b));
            results.push($op_name::$fun(&a, b.clone()));
            results.push($op_name::$fun(a.clone(), &b));
            results.push($op_name::$fun(a.clone(), b.clone()));
            results.push($op_name::$fun(&a, &literal));
            results.push($op_name::$fun(&a, literal.clone()));
            results.push($op_name::$fun(a.clone(), &literal));
            results.push($op_name::$fun(a.clone(), literal.clone()));

            let mut n = a.clone();
            $opassign_name::$funassign(&mut n, &b);
            results.push(n);
            let mut n = a.clone();
            $opassign_name::$funassign(&mut n, b);
            results.push(n);
            let mut n = a.clone();
            $opassign_name::$funassign(&mut n, &literal);
            results.push(n);
            let mut n = a.clone();
            $opassign_name::$funassign(&mut n, literal);
            results.push(n);

            for i in 1..results.len() {
                assert_eq!(results[0], results[i]);
            }
        }
    };
}

op_bound!(
    (AddImplementations, Add, add),
    (AddAssignImplementations, AddAssign, add_assign)
);
op_bound!(
    (SubImplementations, Sub, sub),
    (SubAssignImplementations, SubAssign, sub_assign)
);
op_bound!(
    (MulImplementations, Mul, mul),
    (MulAssignImplementations, MulAssign, mul_assign)
);
op_bound!(
    (DivImplementations, Div, div),
    (DivAssignImplementations, DivAssign, div_assign)
);
op_bound!(
    (RemImplementations, Rem, rem),
    (RemAssignImplementations, RemAssign, rem_assign)
);

op_bound!(
    (BitAndImplementations, BitAnd, bitand),
    (BitAndAssignImplementations, BitAndAssign, bitand_assign)
);
op_bound!(
    (BitOrImplementations, BitOr, bitor),
    (BitOrAssignImplementations, BitOrAssign, bitor_assign)
);
op_bound!(
    (BitXorImplementations, BitXor, bitxor),
    (BitXorAssignImplementations, BitXorAssign, bitxor_assign)
);