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

// Copyright (C) 2019-2023 Aleo Systems Inc.
// This file is part of the snarkVM library.

// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at:
// http://www.apache.org/licenses/LICENSE-2.0

// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/// Trait for equality comparisons.
pub trait Equal<Rhs: ?Sized = Self> {
    type Output;

    /// Returns `true` if `self` and `other` are equal.
    fn is_equal(&self, other: &Rhs) -> Self::Output;

    /// Returns `true` if `self` and `other` are *not* equal.
    fn is_not_equal(&self, other: &Rhs) -> Self::Output;
}

/// Trait for comparator operations.
pub trait Compare<Rhs: ?Sized = Self> {
    type Output;

    /// Returns `true` if `self` is less than `other`.
    fn is_less_than(&self, other: &Rhs) -> Self::Output;

    /// Returns `true` if `self` is greater than `other`.
    fn is_greater_than(&self, other: &Rhs) -> Self::Output;

    /// Returns `true` if `self` is less than or equal to `other`.
    fn is_less_than_or_equal(&self, other: &Rhs) -> Self::Output;

    /// Returns `true` if `self` is greater than or equal to `other`.
    fn is_greater_than_or_equal(&self, other: &Rhs) -> Self::Output;
}

/// Binary operator for performing `NOT (a AND b)`.
pub trait Nand<Rhs: ?Sized = Self> {
    type Output;

    /// Returns `NOT (a AND b)`.
    fn nand(&self, other: &Rhs) -> Self::Output;
}

/// Binary operator for performing `(NOT a) AND (NOT b)`.
pub trait Nor<Rhs: ?Sized = Self> {
    type Output;

    /// Returns `(NOT a) AND (NOT b)`.
    fn nor(&self, other: &Rhs) -> Self::Output;
}

/// Trait for ternary operations.
pub trait Ternary {
    type Boolean;
    type Output;

    /// Returns `first` if `condition` is `true`, otherwise returns `second`.
    fn ternary(condition: &Self::Boolean, first: &Self, second: &Self) -> Self::Output
    where
        Self: Sized;
}