Add serde feature

Fixes: #4

Cargo.toml

@@ -25,8 +25,10 @@ default = ["fallible"]
 [dependencies]
 array-init = "2.1.0"
 generic_singleton = "0.4.1"
+num-complex = { version = "0.4.5", features = ["serde"] }
 realfft = { version = "3.0.1"}
 rustfft = "6.0.1"
+serde = { version = "1.0.193", features = ["derive"] , optional = true}
 
 [dev-dependencies]
 approx = "0.5.1"

src/dyn_size/realfft.rs

@@ -28,6 +28,12 @@ use realfft::ComplexToReal;
 use realfft::RealToComplex;
 use rustfft::num_complex::Complex;
 use rustfft::FftNum;
+
+#[cfg(feature = "serde")]
+use serde::Deserialize;
+#[cfg(feature = "serde")]
+use serde::Serialize;
+
 use std::collections::HashMap;
 use std::fmt::Debug;
 #[cfg(feature = "fallible")]
@@ -173,6 +179,7 @@ impl<T: FftNum + Default, U: ?Sized + RealToComplex<T>> StaticScratchRealToCompl
 /// [known to be symmetric]: https://en.wikipedia.org/wiki/Discrete_Fourier_transform#DFT_of_real_and_purely_imaginary_signals
 /// [phantom type]: https://doc.rust-lang.org/rust-by-example/generics/phantom.html
 #[derive(Debug, Clone)]
+#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 pub struct DynRealDft<T> {
     original_length: usize,
     inner: Box<[Complex<T>]>,