add serialize trait

1 files changed, 6 insertions, 0 deletions

diff --git a/src/lib.rs b/src/lib.rs
index 93eca2a..9faf4d8 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,7 +1,13 @@
+use std::io::{self, Write};
+
 use proc_macro::TokenStream;
 use quote::quote;
 use syn::{parse, ItemStruct};
 
+pub trait Serialize {
+    fn serialize<W: Write>(&self, w: W) -> io::Result<()>;
+}
+
 #[proc_macro_derive(Serialize)]
 pub fn derive_serialize(item: TokenStream) -> TokenStream {
     let ast: ItemStruct = parse(item).unwrap();