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Introduce Complex::from_real() #151

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Introduce Complex::from_real() #151

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e03807f
impl from_real
PaulXiCao Oct 25, 2025
648072c
tests
PaulXiCao Oct 25, 2025
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27 changes: 27 additions & 0 deletions src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -134,6 +134,14 @@ impl<T> Complex<T> {
}
}

impl<T: Zero> Complex<T> {
/// Create a new `Complex` from a real number.
#[inline]
pub fn from_real(re: T) -> Self {
Self::new(re, T::zero())
}
}

impl<T: Clone + Num> Complex<T> {
/// Returns the imaginary unit.
///
Expand Down Expand Up @@ -1672,6 +1680,25 @@ pub(crate) mod test {
pub const _nan_neg1i: Complex64 = Complex::new(f64::NAN, -1.0);
pub const _nan_nani: Complex64 = Complex::new(f64::NAN, f64::NAN);

#[test]
fn test_from_real() {
for re in [
-3.123,
-1.0,
0.0,
1.0,
5.67,
f64::INFINITY,
f64::NEG_INFINITY,
] {
assert_eq!(Complex::new(re, 0.0), Complex::from_real(re));
}
{
let x = Complex::from_real(f64::NAN);
assert!(x.re.is_nan() && x.im.is_zero());
}
}

#[test]
fn test_consts() {
// check our constants are what Complex::new creates
Expand Down