Use serde for json configuration file

euler/Cargo.toml

@@ -8,11 +8,13 @@ edition = "2018"
 # Internal feature flag to gate the expensive tests
 # which should be run only in release builds
 expensive_tests = []
+serde1 = ["serde", "arrayvec/serde"]
 
 [dependencies]
 ndarray = "0.13.1"
 sbp = { path = "../sbp" }
 arrayvec = "0.5.1"
+serde = { version = "1.0.115", default-features = false, optional = true, features = ["derive"] }
 
 [dev-dependencies]
 criterion = "0.3.2"

euler/src/lib.rs

@@ -402,6 +402,7 @@ fn h2_diff() {
 }
 
 #[derive(Copy, Clone, Debug)]
+#[cfg_attr(feature = "serde1", derive(Serialize, Deserialize))]
 pub struct Vortice {
     pub x0: Float,
     pub y0: Float,
@@ -409,7 +410,11 @@ pub struct Vortice {
     pub eps: Float,
 }
 
+#[cfg(feature = "serde1")]
+use serde::{Deserialize, Serialize};
+
 #[derive(Clone, Debug)]
+#[cfg_attr(feature = "serde1", derive(Serialize, Deserialize))]
 pub struct VortexParameters {
     pub vortices: ArrayVec<[Vortice; 5]>,
     pub mach: Float,