add function_cache for performence gain

1 files changed, 16 insertions, 0 deletions

diff --git a/src/math/complex.rs b/src/math/complex.rs
index 5b95df4..4d85155 100644
--- a/src/math/complex.rs
+++ b/src/math/complex.rs
@@ -1,4 +1,5 @@
 use std::f64::consts::E;
+use std::hash::Hash;
 use std::num::ParseFloatError;
 use std::str::FromStr;
 
@@ -75,6 +76,21 @@ impl std::fmt::Display for Complex {
     }
 }
 
+impl PartialEq for Complex {
+    fn eq(&self, other: &Self) -> bool {
+        self.real == other.real && self.imag == other.imag
+    }
+}
+
+impl Hash for Complex {
+    fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
+        format!("{}#{}", self.real, self.imag).hash(state);
+        state.finish();
+    }
+}
+
+impl Eq for Complex {}
+
 #[derive(Debug)]
 pub struct ComplexParseError;