From 965ca9a5653506f19853146f649cc8e74b3713f1 Mon Sep 17 00:00:00 2001
From: Alden Torres <aldenml@gmail.com>
Date: Mon, 9 Jul 2018 12:19:43 -0400
Subject: [PATCH] avoid copy of arrays in dht alerts constructors

---
 include/libtorrent/alert_types.hpp | 6 +++---
 src/alert.cpp                      | 8 ++++----
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/include/libtorrent/alert_types.hpp b/include/libtorrent/alert_types.hpp
index 0f159a00f..e0422243c 100644
--- a/include/libtorrent/alert_types.hpp
+++ b/include/libtorrent/alert_types.hpp
@@ -2214,7 +2214,7 @@ TORRENT_VERSION_NAMESPACE_2
 	struct TORRENT_EXPORT dht_mutable_item_alert final : alert
 	{
 		dht_mutable_item_alert(aux::stack_allocator& alloc
-			, std::array<char, 32> k, std::array<char, 64> sig
+			, std::array<char, 32> const& k, std::array<char, 64> const& sig
 			, std::int64_t sequence, string_view s, entry const& i, bool a);
 
 		TORRENT_DEFINE_ALERT_PRIO(dht_mutable_item_alert, 75, alert_priority_critical)
@@ -2252,8 +2252,8 @@ TORRENT_VERSION_NAMESPACE_2
 	{
 		// internal
 		dht_put_alert(aux::stack_allocator& alloc, sha1_hash const& t, int n);
-		dht_put_alert(aux::stack_allocator& alloc, std::array<char, 32> key
-			, std::array<char, 64> sig
+		dht_put_alert(aux::stack_allocator& alloc, std::array<char, 32> const& key
+			, std::array<char, 64> const& sig
 			, std::string s
 			, std::int64_t sequence_number
 			, int n);
diff --git a/src/alert.cpp b/src/alert.cpp
index 554a02f06..709ff64c3 100644
--- a/src/alert.cpp
+++ b/src/alert.cpp
@@ -1680,8 +1680,8 @@ namespace {
 	// TODO: 2 the salt here is allocated on the heap. It would be nice to
 	// allocate in in the stack_allocator
 	dht_mutable_item_alert::dht_mutable_item_alert(aux::stack_allocator&
-		, std::array<char, 32> k
-		, std::array<char, 64> sig
+		, std::array<char, 32> const& k
+		, std::array<char, 64> const& sig
 		, std::int64_t sequence
 		, string_view s
 		, entry const& i
@@ -1711,8 +1711,8 @@ namespace {
 	{}
 
 	dht_put_alert::dht_put_alert(aux::stack_allocator&
-		, std::array<char, 32> key
-		, std::array<char, 64> sig
+		, std::array<char, 32> const& key
+		, std::array<char, 64> const& sig
 		, std::string s
 		, std::int64_t sequence_number
 		, int n)