dynamic_weighted_index/
numeric.rs

1pub trait FloatingPointParts {
2    const BITS_MANTISSA: usize;
3    const BITS_EXPONENT: usize;
4    type BitsType;
5
6    fn get_mantissa(&self) -> Self::BitsType;
7    fn get_exponent(&self) -> Self::BitsType;
8    fn get_sign(&self) -> bool;
9
10    fn compose(mantissa: Self::BitsType, exponent: Self::BitsType, sign: bool) -> Self;
11}
12
13macro_rules! fpp_impl {
14    () => {
15        fn get_mantissa(&self) -> Self::BitsType {
16            self.to_bits() & ((1 << Self::BITS_MANTISSA) - 1)
17        }
18
19        fn get_exponent(&self) -> Self::BitsType {
20            (self.to_bits() >> Self::BITS_MANTISSA) & ((1 << Self::BITS_EXPONENT) - 1)
21        }
22
23        fn get_sign(&self) -> bool {
24            (self.to_bits() >> (Self::BITS_EXPONENT + Self::BITS_MANTISSA)) == 1
25        }
26
27        fn compose(mantissa: Self::BitsType, exponent: Self::BitsType, sign: bool) -> Self {
28            Self::from_bits(
29                mantissa
30                    | (exponent << Self::BITS_MANTISSA)
31                    | ((sign as Self::BitsType) << (Self::BITS_EXPONENT + Self::BITS_MANTISSA)),
32            )
33        }
34    };
35}
36
37impl FloatingPointParts for f32 {
38    const BITS_MANTISSA: usize = 23;
39    const BITS_EXPONENT: usize = 8;
40    type BitsType = u32;
41
42    fpp_impl!();
43}
44
45impl FloatingPointParts for f64 {
46    const BITS_MANTISSA: usize = 52;
47    const BITS_EXPONENT: usize = 11;
48    type BitsType = u64;
49
50    fpp_impl!();
51}
dynamic_weighted_index/numeric.rs

dynamic_weighted_index/
numeric.rs
