From 1a7dbe8cde534a5585451db5f6f33b5caa0f6abf Mon Sep 17 00:00:00 2001
From: Matt Corallo <git@bluematt.me>
Date: Fri, 23 Jul 2021 18:11:45 +0000
Subject: [PATCH] Swap VecWriteWrapper's inner for an iterator to make it more
 generic

---
 lightning/src/util/events.rs     | 4 ++--
 lightning/src/util/ser.rs        | 8 ++++----
 lightning/src/util/ser_macros.rs | 4 ++--
 3 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/lightning/src/util/events.rs b/lightning/src/util/events.rs
index e90f443b0..f26b70589 100644
--- a/lightning/src/util/events.rs
+++ b/lightning/src/util/events.rs
@@ -21,7 +21,7 @@ use ln::msgs;
 use ln::msgs::DecodeError;
 use ln::{PaymentPreimage, PaymentHash, PaymentSecret};
 use routing::network_graph::NetworkUpdate;
-use util::ser::{BigSize, FixedLengthReader, Writeable, Writer, MaybeReadable, Readable, VecReadWrapper, VecWriteWrapper};
+use util::ser::{BigSize, FixedLengthReader, Writeable, Writer, MaybeReadable, Readable, VecReadWrapper, IterWriteWrapper};
 use routing::router::{RouteHop, RouteParameters};
 
 use bitcoin::Transaction;
@@ -424,7 +424,7 @@ impl Writeable for Event {
 			&Event::SpendableOutputs { ref outputs } => {
 				5u8.write(writer)?;
 				write_tlv_fields!(writer, {
-					(0, VecWriteWrapper(outputs), required),
+					(0, IterWriteWrapper(outputs.iter()), required),
 				});
 			},
 			&Event::PaymentForwarded { fee_earned_msat, claim_from_onchain_tx } => {
diff --git a/lightning/src/util/ser.rs b/lightning/src/util/ser.rs
index 8fb72a8f9..cb883d8b2 100644
--- a/lightning/src/util/ser.rs
+++ b/lightning/src/util/ser.rs
@@ -244,12 +244,12 @@ impl<T: Readable> Readable for OptionDeserWrapper<T> {
 	}
 }
 
-/// Wrapper to write each element of a Vec with no length prefix
-pub(crate) struct VecWriteWrapper<'a, T: Writeable>(pub &'a Vec<T>);
-impl<'a, T: Writeable> Writeable for VecWriteWrapper<'a, T> {
+/// Wrapper to write each element of an iterator with no length prefix
+pub(crate) struct IterWriteWrapper<I: Iterator + Clone>(pub I) where I::Item: Writeable;
+impl<I: Iterator + Clone> Writeable for IterWriteWrapper<I> where I::Item: Writeable {
 	#[inline]
 	fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
-		for ref v in self.0.iter() {
+		for v in self.0.clone() {
 			v.write(writer)?;
 		}
 		Ok(())
diff --git a/lightning/src/util/ser_macros.rs b/lightning/src/util/ser_macros.rs
index 165d1f1ed..43bbe3d68 100644
--- a/lightning/src/util/ser_macros.rs
+++ b/lightning/src/util/ser_macros.rs
@@ -17,7 +17,7 @@ macro_rules! encode_tlv {
 		$field.write($stream)?;
 	};
 	($stream: expr, $type: expr, $field: expr, vec_type) => {
-		encode_tlv!($stream, $type, ::util::ser::VecWriteWrapper(&$field), required);
+		encode_tlv!($stream, $type, ::util::ser::IterWriteWrapper($field.iter()), required);
 	};
 	($stream: expr, $optional_type: expr, $optional_field: expr, option) => {
 		if let Some(ref field) = $optional_field {
@@ -66,7 +66,7 @@ macro_rules! get_varint_length_prefixed_tlv_length {
 		$len.0 += field_len;
 	};
 	($len: expr, $type: expr, $field: expr, vec_type) => {
-		get_varint_length_prefixed_tlv_length!($len, $type, ::util::ser::VecWriteWrapper(&$field), required);
+		get_varint_length_prefixed_tlv_length!($len, $type, ::util::ser::IterWriteWrapper($field.iter()), required);
 	};
 	($len: expr, $optional_type: expr, $optional_field: expr, option) => {
 		if let Some(ref field) = $optional_field {
-- 
2.39.5