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+/* Copyright 2016 Joaquin M Lopez Munoz.
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ *
+ * See http://www.boost.org/libs/poly_collection for library home page.
+ */
+
+#ifndef BOOST_POLY_COLLECTION_DETAIL_IS_ACCEPTABLE_HPP
+#define BOOST_POLY_COLLECTION_DETAIL_IS_ACCEPTABLE_HPP
+
+#if defined(_MSC_VER)
+#pragma once
+#endif
+
+#include <type_traits>
+
+namespace boost{
+
+namespace poly_collection{
+
+namespace detail{
+
+/* This can be further specialized by Model when the std type trait classes
+ * fail to give the right info (as it can happen with class templates whose
+ * nominally existing operators do not compile for certain instantiations).
+ */
+
+template<typename T,typename Model,typename=void>
+struct is_acceptable:std::integral_constant<
+ bool,
+ Model::template is_subtype<T>::value&&
+ std::is_move_constructible<typename std::decay<T>::type>::value&&
+ (std::is_move_assignable<typename std::decay<T>::type>::value||
+ std::is_nothrow_move_constructible<typename std::decay<T>::type>::value)
+>{};
+
+} /* namespace poly_collection::detail */
+
+} /* namespace poly_collection */
+
+} /* namespace boost */
+
+#endif