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diff --git a/boost/callable_traits/detail/function_object.hpp b/boost/callable_traits/detail/function_object.hpp
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+++ b/boost/callable_traits/detail/function_object.hpp
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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_DETAIL_FUNCTION_OBJECT_HPP
+#define BOOST_CLBL_TRTS_DETAIL_FUNCTION_OBJECT_HPP
+
+#include <boost/callable_traits/detail/pmf.hpp>
+#include <boost/callable_traits/detail/default_callable_traits.hpp>
+#include <boost/callable_traits/detail/forward_declarations.hpp>
+#include <boost/callable_traits/detail/utility.hpp>
+
+namespace boost { namespace callable_traits { namespace detail {
+
+template<typename T, typename Base>
+struct function_object : Base {
+
+    using type = T;
+    using error_t = error_type<T>;
+    using function_type = typename Base::function_object_signature;
+    using arg_types = typename Base::non_invoke_arg_types;
+    using non_invoke_arg_types = arg_types;
+
+    static constexpr const bool value = std::is_class<
+        typename std::remove_reference<T>::type>::value;
+
+    using traits = function_object;
+    using class_type = error_t;
+    using invoke_type = error_t;
+    using remove_varargs = error_t;
+    using add_varargs = error_t;
+    using is_noexcept = typename Base::is_noexcept;
+    using add_noexcept = error_t;
+    using remove_noexcept = error_t;
+    using is_transaction_safe = typename Base::is_transaction_safe;
+    using add_transaction_safe = error_t;
+    using remove_transaction_safe = error_t;
+    using clear_args = error_t;
+
+    template<template<class...> class Container>
+    using expand_args = typename function<function_type>::template
+        expand_args<Container>;
+
+    template<template<class...> class Container, typename... RightArgs>
+    using expand_args_left = typename function<function_type>::template
+        expand_args_left<Container, RightArgs...>;
+
+    template<template<class...> class Container, typename... LeftArgs>
+    using expand_args_right = typename function<function_type>::template
+        expand_args_right<Container, LeftArgs...>;
+
+    template<typename C, typename U = T>
+    using apply_member_pointer =
+        typename std::remove_reference<U>::type C::*;
+
+    template<typename>
+    using apply_return = error_t;
+
+    template<typename...>
+    using push_front = error_t;
+    
+    template<typename...>
+    using push_back = error_t;
+    
+    template<std::size_t ElementCount>
+    using pop_args_front = error_t;
+
+    template<std::size_t ElementCount>
+    using pop_args_back = error_t;
+    
+    template<std::size_t Index, typename... NewArgs>
+    using insert_args = error_t;
+    
+    template<std::size_t Index, std::size_t Count>
+    using remove_args = error_t;
+
+    template<std::size_t Index, typename... NewArgs>
+    using replace_args = error_t;
+
+    template<std::size_t Count>
+    using pop_front = error_t;
+
+    template<std::size_t Count>
+    using pop_back = error_t;
+
+    using remove_member_reference = error_t;
+    using add_member_lvalue_reference = error_t;
+    using add_member_rvalue_reference = error_t;
+    using add_member_const = error_t;
+    using add_member_volatile = error_t;
+    using add_member_cv = error_t;
+    using remove_member_const = error_t;
+    using remove_member_volatile = error_t;
+    using remove_member_cv = error_t;
+};
+
+template<typename T, typename U, typename Base>
+struct function_object <T U::*, Base>
+    : default_callable_traits<> {};
+
+}}} // namespace boost::callable_traits::detail
+
+#endif // #ifndef BOOST_CLBL_TRTS_DETAIL_FUNCTION_OBJECT_HPP