From 170c2a69843e5214dd0df6f0c91cf3d10ed1e57d Mon Sep 17 00:00:00 2001
From: Matthew Fioravante <fmatthew5876@gmail.com>
Date: Wed, 4 Oct 2017 22:42:40 -0400
Subject: [PATCH] Fixes to copy_ptr

* Add move constructor
* Add move assignment
* Fix exception safety bug in copy assignment
---
 include/libtorrent/copy_ptr.hpp | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/include/libtorrent/copy_ptr.hpp b/include/libtorrent/copy_ptr.hpp
index d605d45c8..953dfc0e1 100644
--- a/include/libtorrent/copy_ptr.hpp
+++ b/include/libtorrent/copy_ptr.hpp
@@ -41,12 +41,22 @@ namespace libtorrent {
 		copy_ptr(): m_ptr(nullptr) {}
 		explicit copy_ptr(T* t): m_ptr(t) {}
 		copy_ptr(copy_ptr const& p): m_ptr(p.m_ptr ? new T(*p.m_ptr) : nullptr) {}
+		copy_ptr(copy_ptr&& p) noexcept : m_ptr(p.m_ptr) { p.m_ptr = nullptr; }
+
 		void reset(T* t = nullptr) { delete m_ptr; m_ptr = t; }
 		copy_ptr& operator=(copy_ptr const& p)
 		{
 			if (m_ptr == p.m_ptr) return *this;
+			T* c = p.m_ptr ? new T(*p.m_ptr) : nullptr;
 			delete m_ptr;
-			m_ptr = p.m_ptr ? new T(*p.m_ptr) : nullptr;
+			m_ptr = c;
+			return *this;
+		}
+		copy_ptr& operator=(copy_ptr&& p) noexcept {
+			if(m_ptr == p.m_ptr) return *this;
+			delete m_ptr;
+			m_ptr = p.m_ptr;
+			p.m_ptr = nullptr;
 			return *this;
 		}
 		T* operator->() { return m_ptr; }