From 05e5ee1be662532e9a93f971d47775e0b87a6ff5 Mon Sep 17 00:00:00 2001
From: Kittywhiskers Van Gogh <6098974-kittywhiskers@users.noreply.gitlab.com>
Date: Wed, 26 May 2021 15:04:39 +0300
Subject: [PATCH] partial merge #8149: import OverrideStream from "BIP144:
 Serialization, hashes, relay (sender side)"

---
 src/streams.h | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/src/streams.h b/src/streams.h
index 21db4ba6dd..5d0be5ab9c 100644
--- a/src/streams.h
+++ b/src/streams.h
@@ -22,6 +22,33 @@
 #include <utility>
 #include <vector>
 
+template<typename Stream>
+class OverrideStream
+{
+    Stream* stream;
+public:
+    const int nType;
+    const int nVersion;
+
+    OverrideStream(Stream* stream_, int nType_, int nVersion_) : stream(stream_), nType(nType_), nVersion(nVersion_) {}
+
+    template<typename T>
+    OverrideStream<Stream>& operator<<(const T& obj)
+    {
+        // Serialize to this stream
+        ::Serialize(*this->stream, obj);
+        return (*this);
+    }
+
+    template<typename T>
+    OverrideStream<Stream>& operator>>(T& obj)
+    {
+        // Unserialize from this stream
+        ::Unserialize(*this->stream, obj);
+        return (*this);
+    }
+};
+
 /* Minimal stream for overwriting and/or appending to an existing byte vector
  *
  * The referenced vector will grow as necessary