Imported Upstream version 1.64.0

[platform/upstream/boost.git] / boost / variant / recursive_wrapper_fwd.hpp

diff --git a/boost/variant/recursive_wrapper_fwd.hpp b/boost/variant/recursive_wrapper_fwd.hpp
index 2fc4341..c40399f 100644 (file)
--- a/boost/variant/recursive_wrapper_fwd.hpp
+++ b/boost/variant/recursive_wrapper_fwd.hpp
@@ -4,7 +4,7 @@
 //-----------------------------------------------------------------------------
 //
 // Copyright (c) 2002 Eric Friedman, Itay Maman
-// Copyright (c) 2016 Antony Polukhin
+// Copyright (c) 2016-2017 Antony Polukhin
 //
 // Portions Copyright (C) 2002 David Abrahams
 //
@@ -20,6 +20,7 @@
 #include <boost/mpl/aux_/lambda_support.hpp>
 #include <boost/type_traits/integral_constant.hpp>
 #include <boost/type_traits/is_constructible.hpp>
+#include <boost/type_traits/is_nothrow_move_constructible.hpp>
 
 namespace boost {
 
@@ -65,6 +66,9 @@ template <class T, class U> struct is_constructible<recursive_wrapper<T>, const
 template <class T, class U> struct is_constructible<recursive_wrapper<T>, recursive_wrapper<U>& >       : boost::false_type{};
 template <class T, class U> struct is_constructible<recursive_wrapper<T>, const recursive_wrapper<U>& > : boost::false_type{};
 
+// recursive_wrapper is not nothrow move constructible, because it's constructor does dynamic memory allocation.
+// This specialisation is required to workaround GCC6 issue: https://svn.boost.org/trac/boost/ticket/12680
+template <class T> struct is_nothrow_move_constructible<recursive_wrapper<T> > : boost::false_type{};
 
 ///////////////////////////////////////////////////////////////////////////////
 // metafunction is_recursive_wrapper (modeled on code by David Abrahams)