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+/*
+ *
+@Copyright Barrett Adair 2015-2017
+
+Distributed under the Boost Software License, Version 1.0.
+(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
+
+*/
+
+#ifndef BOOST_CLBL_TRTS_IS_VOLATILE_MEMBER_HPP
+#define BOOST_CLBL_TRTS_IS_VOLATILE_MEMBER_HPP
+
+#include <boost/callable_traits/detail/core.hpp>
+
+namespace boost { namespace callable_traits {
+
+//[ is_volatile_member_hpp
+/*`[section:ref_is_volatile_member is_volatile_member]
+[heading Header]
+``#include <boost/callable_traits/is_volatile_member.hpp>``
+[heading Definition]
+*/
+
+
+// inherits from either std::true_type or std::false_type
+template<typename T>
+struct is_volatile_member;
+
+//<-
+template<typename T>
+struct is_volatile_member : detail::traits<
+    detail::shallow_decay<T>>::is_volatile_member {
+
+    using type = typename detail::traits<
+        detail::shallow_decay<T>>::is_volatile_member;
+};
+
+#ifdef BOOST_CLBL_TRTS_DISABLE_VARIABLE_TEMPLATES
+
+template<typename T>
+struct is_volatile_member_v {
+    static_assert(std::is_same<T, detail::dummy>::value,
+        "Variable templates not supported on this compiler.");
+};
+
+#else
+//->
+// only available when variable templates are supported
+template<typename T>
+//<-
+BOOST_CLBL_TRAITS_INLINE_VAR
+//->
+constexpr bool is_volatile_member_v = //see below
+//<-
+    detail::traits<detail::shallow_decay<T>>::is_volatile_member::value;
+
+#endif
+
+}} // namespace boost::callable_traits
+//->
+
+
+/*`
+[heading Constraints]
+* none
+
+[heading Behavior]
+* `is_volatile_member<T>::value` is `true` when either: 
+  * `T` is a function type with a `volatile` member qualifier
+  * `T` is a pointer to a member function with a `volatile` member qualifier
+  * `T` is a function object with a non-overloaded `operator()`, where the `operator()` has a `volatile` member qualifier
+* On compilers that support variable templates, `is_volatile_member_v<T>` is equivalent to `is_volatile_member<T>::value`.
+
+[heading Input/Output Examples]
+[table
+    [[`T`]                              [`is_volatile_member_v<T>`]]
+    [[`int() volatile`]                 [`true`]]
+    [[`int() const volatile`]           [`true`]]
+    [[`int() volatile &&`]              [`true`]]
+    [[`int(foo::*)() volatile`]         [`true`]]
+    [[`int(foo::* const)() volatile`]   [`true`]]
+    [[`int(foo::*)() const volatile`]   [`true`]]
+    [[`int(foo::*)() const volatile &&`][`true`]]
+    [[`int()`]                          [`false`]]
+    [[`int() const`]                    [`false`]]
+    [[`int() &&`]                       [`false`]]
+    [[`int(*)()`]                       [`false`]]
+    [[`int`]                            [`false`]]
+    [[`int foo::*`]                     [`false`]]
+    [[`volatile int foo::*`]            [`false`]]
+]
+
+[heading Example Program]
+[import ../example/is_volatile_member.cpp]
+[is_volatile_member]
+[endsect]
+*/
+//]
+
+#endif // #ifndef BOOST_CLBL_TRTS_IS_VOLATILE_MEMBER_HPP