Extract read/write variants from impl_for_vec

We'll need to (de)serialize vecs of BlindedPaths differently based on whether
we're writing or reading

Author: valentinewallace

lightning/src/util/ser.rs

@@ -749,7 +749,7 @@ where T: Readable + Eq + Hash
 }
 
 // Vectors
-macro_rules! impl_for_vec {
+macro_rules! impl_writeable_for_vec {
 	($ty: ty $(, $name: ident)*) => {
 		impl<$($name : Writeable),*> Writeable for Vec<$ty> {
 			#[inline]
@@ -761,7 +761,10 @@ macro_rules! impl_for_vec {
 				Ok(())
 			}
 		}
-
+	}
+}
+macro_rules! impl_readable_for_vec {
+	($ty: ty $(, $name: ident)*) => {
 		impl<$($name : Readable),*> Readable for Vec<$ty> {
 			#[inline]
 			fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
@@ -777,6 +780,12 @@ macro_rules! impl_for_vec {
 		}
 	}
 }
+macro_rules! impl_for_vec {
+	($ty: ty $(, $name: ident)*) => {
+		impl_writeable_for_vec!($ty $(, $name)*);
+		impl_readable_for_vec!($ty $(, $name)*);
+	}
+}
 
 impl Writeable for Vec<u8> {
 	#[inline]