trait definition and struct-tuple example

src/generic.rs

@@ -0,0 +1,31 @@
+pub struct Sum<Con, Rhs> where Con: IsConType, Rhs: IsRepType {
+    pub left: Con,
+    pub right: Rhs,
+}
+
+pub struct Product<T, Rhs> where Rhs: IsConType {
+    pub left: Field<T>,
+    pub right: Rhs
+}
+
+pub struct Field<T> {
+    pub value: T
+}
+
+// types used for generic representation
+pub trait IsRepType {}
+impl<Lhs: IsConType, Rhs: IsRepType> IsRepType for Sum<Lhs, Rhs> {}
+impl<T: IsRepType, Rhs: IsConType> IsRepType for Product<T, Rhs> {}
+impl<T> IsRepType for Field<T> {}
+
+// types that represent constructors
+pub trait IsConType {}
+impl<T, Rhs: IsConType> IsConType for Product<T, Rhs> {}
+impl<T> IsConType for Field<T> {}
+
+
+pub trait Generic {
+    type Representation: IsRepType;
+    fn generalize(self) -> Self::Representation;
+    fn specialize(rep: Self::Representation) -> Self;
+}