num_complex/
cast.rs

1use super::Complex;
2use num_traits::{AsPrimitive, FromPrimitive, Num, NumCast, ToPrimitive};
3
4macro_rules! impl_to_primitive {
5    ($ty:ty, $to:ident) => {
6        #[inline]
7        fn $to(&self) -> Option<$ty> {
8            if self.im.is_zero() {
9                self.re.$to()
10            } else {
11                None
12            }
13        }
14    };
15} // impl_to_primitive
16
17// Returns None if Complex part is non-zero
18impl<T: ToPrimitive + Num> ToPrimitive for Complex<T> {
19    impl_to_primitive!(usize, to_usize);
20    impl_to_primitive!(isize, to_isize);
21    impl_to_primitive!(u8, to_u8);
22    impl_to_primitive!(u16, to_u16);
23    impl_to_primitive!(u32, to_u32);
24    impl_to_primitive!(u64, to_u64);
25    impl_to_primitive!(i8, to_i8);
26    impl_to_primitive!(i16, to_i16);
27    impl_to_primitive!(i32, to_i32);
28    impl_to_primitive!(i64, to_i64);
29    impl_to_primitive!(u128, to_u128);
30    impl_to_primitive!(i128, to_i128);
31    impl_to_primitive!(f32, to_f32);
32    impl_to_primitive!(f64, to_f64);
33}
34
35macro_rules! impl_from_primitive {
36    ($ty:ty, $from_xx:ident) => {
37        #[inline]
38        fn $from_xx(n: $ty) -> Option<Self> {
39            Some(Complex {
40                re: T::$from_xx(n)?,
41                im: T::zero(),
42            })
43        }
44    };
45} // impl_from_primitive
46
47impl<T: FromPrimitive + Num> FromPrimitive for Complex<T> {
48    impl_from_primitive!(usize, from_usize);
49    impl_from_primitive!(isize, from_isize);
50    impl_from_primitive!(u8, from_u8);
51    impl_from_primitive!(u16, from_u16);
52    impl_from_primitive!(u32, from_u32);
53    impl_from_primitive!(u64, from_u64);
54    impl_from_primitive!(i8, from_i8);
55    impl_from_primitive!(i16, from_i16);
56    impl_from_primitive!(i32, from_i32);
57    impl_from_primitive!(i64, from_i64);
58    impl_from_primitive!(u128, from_u128);
59    impl_from_primitive!(i128, from_i128);
60    impl_from_primitive!(f32, from_f32);
61    impl_from_primitive!(f64, from_f64);
62}
63
64impl<T: NumCast + Num> NumCast for Complex<T> {
65    fn from<U: ToPrimitive>(n: U) -> Option<Self> {
66        Some(Complex {
67            re: T::from(n)?,
68            im: T::zero(),
69        })
70    }
71}
72
73impl<T, U> AsPrimitive<U> for Complex<T>
74where
75    T: AsPrimitive<U>,
76    U: 'static + Copy,
77{
78    fn as_(self) -> U {
79        self.re.as_()
80    }
81}
82
83#[cfg(test)]
84mod test {
85    use super::*;
86
87    #[test]
88    fn test_to_primitive() {
89        let a: Complex<u32> = Complex { re: 3, im: 0 };
90        assert_eq!(a.to_i32(), Some(3_i32));
91        let b: Complex<u32> = Complex { re: 3, im: 1 };
92        assert_eq!(b.to_i32(), None);
93        let x: Complex<f32> = Complex { re: 1.0, im: 0.1 };
94        assert_eq!(x.to_f32(), None);
95        let y: Complex<f32> = Complex { re: 1.0, im: 0.0 };
96        assert_eq!(y.to_f32(), Some(1.0));
97        let z: Complex<f32> = Complex { re: 1.0, im: 0.0 };
98        assert_eq!(z.to_i32(), Some(1));
99    }
100
101    #[test]
102    fn test_from_primitive() {
103        let a: Complex<f32> = FromPrimitive::from_i32(2).unwrap();
104        assert_eq!(a, Complex { re: 2.0, im: 0.0 });
105    }
106
107    #[test]
108    fn test_num_cast() {
109        let a: Complex<f32> = NumCast::from(2_i32).unwrap();
110        assert_eq!(a, Complex { re: 2.0, im: 0.0 });
111    }
112
113    #[test]
114    fn test_as_primitive() {
115        let a: Complex<f32> = Complex { re: 2.0, im: 0.2 };
116        let a_: i32 = a.as_();
117        assert_eq!(a_, 2_i32);
118    }
119}
num_complex/cast.rs

num_complex/
cast.rs
