binn_ir/
cmp.rs

1/*
2==--==--==--==--==--==--==--==--==--==--==--==--==--==--==--==--
3
4Binn-IR
5
6Copyright (C) 2018-2023  Anonymous
7
8There are several releases over multiple years,
9they are listed as ranges, such as: "2018-2023".
10
11This program is free software: you can redistribute it and/or modify
12it under the terms of the GNU Lesser General Public License as published by
13the Free Software Foundation, either version 3 of the License, or
14(at your option) any later version.
15
16This program is distributed in the hope that it will be useful,
17but WITHOUT ANY WARRANTY; without even the implied warranty of
18MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19GNU Lesser General Public License for more details.
20
21You should have received a copy of the GNU Lesser General Public License
22along with this program.  If not, see <https://www.gnu.org/licenses/>.
23
24::--::--::--::--::--::--::--::--::--::--::--::--::--::--::--::--
25*/
26
27//! # Helper for comparing things
28
29use core::{
30    cmp::Ordering,
31    mem,
32};
33
34/// # Helps compare 2 things
35pub (crate) trait CmpTo<T: Ord>: Ord {
36
37    /// # Comapres to target
38    fn cmp_to(&self, target: &T) -> Ordering;
39
40}
41
42impl CmpTo<u32> for i32 {
43
44    fn cmp_to(&self, target: &u32) -> Ordering {
45        if self < &0 {
46            Ordering::Less
47        } else {
48            (*self as u32).cmp(target)
49        }
50    }
51
52}
53
54macro_rules! impl_cmp_to_for_same_sign {
55    ($($src: ty, $target: ty, $test_fn_name: tt,)+) => {
56        $(
57            #[test]
58            #[allow(unused_comparisons)]
59            fn $test_fn_name() {
60                let min_src = <$src>::min_value();
61                let min_target = <$target>::min_value();
62                assert!((min_src < 0 && min_target < 0) || (min_src >= 0 && min_target >= 0));
63            }
64
65            impl CmpTo<$target> for $src {
66
67                fn cmp_to(&self, target: &$target) -> Ordering {
68                    if mem::size_of::<Self>() >= mem::size_of::<$target>() {
69                        self.cmp(&(*target as Self))
70                    } else {
71                        (*self as $target).cmp(target)
72                    }
73                }
74
75            }
76        )+
77    }
78}
79
80impl_cmp_to_for_same_sign!(
81    usize, u32, test_impl_of_usize_u32,
82    u32, usize, test_impl_of_u32_usize,
83);
84
85macro_rules! impl_cmp_to_for_one_type {
86    ($($ty: ty,)+) => {
87        $(
88            impl CmpTo<$ty> for $ty {
89
90                fn cmp_to(&self, target: &$ty) -> Ordering {
91                    self.cmp(target)
92                }
93
94            }
95        )+
96    }
97}
98
99impl_cmp_to_for_one_type!(usize, u32,);
binn_ir/cmp.rs

binn_ir/
cmp.rs
