some c++11 support

include/libtorrent/bitfield.hpp

@@ -63,6 +63,11 @@ namespace libtorrent
 		bitfield(bitfield const& rhs): m_bytes(0), m_size(0), m_own(false)
 		{ assign(rhs.bytes(), rhs.size()); }
 
+#if __cplusplus > 199711L
+		bitfield(bitfield&& rhs): m_bytes(rhs.m_bytes), m_size(rhs.m_size), m_own(rhs.m_own)
+		{ rhs.m_bytes = NULL; }
+#endif
+
 		// assigns a bitfield pointed to ``b`` of ``bits`` number of bits, without
 		// taking ownership of the buffer. This is a way to avoid copying data and
 		// yet provide a raw buffer to functions that may operate on the bitfield

include/libtorrent/buffer.hpp

@@ -114,6 +114,11 @@ public:
 		std::memcpy(m_begin, b.begin(), b.size());
 	}
 
+#if __cplusplus > 199711L
+	buffer(buffer&& b): m_begin(b.m_begin), m_end(b.m_end), m_last(b.m_last)
+	{ b.m_begin = b.m_end = b.m_last = NULL; }
+#endif
+
 	buffer& operator=(buffer const& b)
 	{
 		if (&b == this) return *this;