crates/prowocessing/src/experimental/trait_based.rs

@@ -5,6 +5,7 @@
 //! - [Builder pattern](https://rust-unofficial.github.io/patterns/patterns/creational/builder.html)
 
 pub mod data;
+#[macro_use]
 pub mod element;
 pub mod ops;
 pub mod pipeline;

crates/prowocessing/src/experimental/trait_based/element.rs

@@ -1,5 +1,7 @@
 //! The trait and type representations
 
+use std::any::TypeId;
+
 use crate::experimental::trait_based::data::io::Inputs;
 
 use super::data::io::Outputs;
@@ -13,13 +15,15 @@ pub(crate) trait PipelineElement {
 
 /// Type signature for an element used for static checking
 pub(crate) struct ElementSignature {
-    pub inputs: Vec<DataType>,
+    pub inputs: Vec<TypeId>,
-    pub outputs: Vec<DataType>,
+    pub outputs: Vec<TypeId>,
 }
 
-/// Data type enum
+macro_rules! signature {
-#[derive(Clone, Copy, PartialEq, Eq, Debug)]
+    ($($inputs:ty),+ => $($outputs:ty),+) => (
-pub enum DataType {
+        ElementSignature {
-    String,
+            inputs: vec![$(std::any::TypeId::of::<$inputs>(), )+],
-    Int,
+            outputs: vec![$(std::any::TypeId::of::<$outputs>(), )+]
+        }
+    )
 }

crates/prowocessing/src/experimental/trait_based/ops/num.rs

@@ -1,12 +1,13 @@
 //! Operations on numeric data
 use core::panic;
+use std::any::TypeId;
 
 use crate::experimental::trait_based::{
     data::{
         io::{Inputs, Outputs},
         raw::Data,
     },
-    element::{DataType, ElementSignature, PipelineElement},
+    element::{ElementSignature, PipelineElement},
 };
 
 /// Addition
@@ -22,10 +23,7 @@ impl PipelineElement for Add {
     }
 
     fn signature(&self) -> ElementSignature {
-        ElementSignature {
+        signature!(i32, i32 => i32)
-            inputs: vec![DataType::Int, DataType::Int],
-            outputs: vec![DataType::Int],
-        }
     }
 }
 
@@ -42,10 +40,7 @@ impl PipelineElement for Subtract {
     }
 
     fn signature(&self) -> ElementSignature {
-        ElementSignature {
+        signature!(i32, i32 => i32)
-            inputs: vec![DataType::Int, DataType::Int],
-            outputs: vec![DataType::Int],
-        }
     }
 }
 
@@ -62,9 +57,6 @@ impl PipelineElement for Stringify {
     }
 
     fn signature(&self) -> ElementSignature {
-        ElementSignature {
+        signature!(i32 => String)
-            inputs: vec![DataType::Int],
-            outputs: vec![DataType::String],
-        }
     }
 }

crates/prowocessing/src/experimental/trait_based/ops/str.rs

@@ -4,7 +4,7 @@ use crate::experimental::trait_based::{
         io::{Inputs, Outputs},
         raw::Data,
     },
-    element::{DataType, ElementSignature, PipelineElement},
+    element::{ElementSignature, PipelineElement},
 };
 
 /// Concatenate the inputs
@@ -20,10 +20,7 @@ impl PipelineElement for Concatenate {
     }
 
     fn signature(&self) -> ElementSignature {
-        ElementSignature {
+        signature!(String, String => String)
-            inputs: vec![DataType::String, DataType::String],
-            outputs: vec![DataType::String],
-        }
     }
 }
 
@@ -40,10 +37,7 @@ impl PipelineElement for Upper {
     }
 
     fn signature(&self) -> ElementSignature {
-        ElementSignature {
+        signature!(String => String)
-            inputs: vec![DataType::String],
-            outputs: vec![DataType::String],
-        }
     }
 }
 
@@ -60,9 +54,6 @@ impl PipelineElement for Lower {
     }
 
     fn signature(&self) -> ElementSignature {
-        ElementSignature {
+        signature!(String => String)
-            inputs: vec![DataType::String],
-            outputs: vec![DataType::String],
-        }
     }
 }