1 files changed, 14 insertions, 5 deletions
diff --git a/src/function.rs b/src/function.rs
index 0da4574..126477c 100644
--- a/src/function.rs
+++ b/src/function.rs
@@ -1,4 +1,4 @@
-use crate::complex::Complex;
+use crate::{complex::Complex, context::Context};
 
 pub struct FunctionArgument {
     args : Vec<Complex>,
@@ -23,16 +23,16 @@ impl FunctionArgument {
 }
 
 pub trait Function {
-    fn eval(&self, args: FunctionArgument) -> Result<Complex, String>;
+    fn eval(&self, args: FunctionArgument, ctx: &Context) -> Result<Complex, String>;
 }
 
 #[macro_export]
 macro_rules! functions {
     {$($x:expr => $y:expr), *} => {
         {
-            let mut h : HashMap<String, Box<dyn Function>> = HashMap::new();
+            let mut h : HashMap<String, Arc<dyn Function>> = HashMap::new();
             $(
-                h.insert($x.to_string(), Box::new($y));
+                h.insert($x.to_string(), Arc::new($y));
             )*
             h
         }
@@ -45,7 +45,7 @@ impl<T> Function for T
 where
     T: Fn(Complex) -> Complex,
 {
-    fn eval(&self, args: FunctionArgument) -> Result<Complex, String> {
+    fn eval(&self, args: FunctionArgument, _ctx: &Context) -> Result<Complex, String> {
         if args.len() == 1 {
             Ok(self(args.get(0)))
         } else {
@@ -53,3 +53,12 @@ where
         }
     }
 }
+
+
+pub struct EmptyFunction {}
+
+impl Function for EmptyFunction {
+    fn eval(&self, _args: FunctionArgument, _ctx: &Context) -> Result<Complex, String> {
+        Err("function not implemented in this scope".to_string())
+    }
+}