Add missing specialization if "add_rvalue_reference" for array types that returns an lvalue reference so that some old compilers don't return errors when using declval()

Author: igaztanaga

include/boost/move/detail/meta_utils.hpp

@@ -18,6 +18,7 @@
 #  pragma once
 #endif
 
+#include <cstddef>
 #include <boost/move/detail/workaround.hpp>  //forceinline
 #include <boost/move/detail/meta_utils_core.hpp>
 #include <boost/move/detail/addressof.hpp>
@@ -527,6 +528,10 @@ template< class T >
 struct add_rvalue_reference<T &>
 {  typedef T & type; };
 
+template< class T, std::size_t N >
+struct add_rvalue_reference<T[N]>
+{  typedef T (&type)[N]; };
+
 #endif // #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
 
 template< class T > struct remove_rvalue_reference { typedef T type; };