Stratosphere: Add WrapIpcCommandImpl templating.

stratosphere/loader/include/boost/callable_traits/class_of.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_class_of_HPP
+#define BOOST_CLBL_TRTS_class_of_HPP
+
+#include <boost/callable_traits/detail/core.hpp>
+
+namespace boost { namespace callable_traits {
+
+//[ class_of_hpp
+/*`
+[section:ref_class_of class_of]
+[heading Header]
+``#include <boost/callable_traits/class_of.hpp>``
+[heading Definition]
+*/
+
+template<typename T>
+using class_of_t = //see below
+//<-
+    detail::try_but_fail_if_invalid<
+        typename detail::traits<detail::shallow_decay<T>>::class_type,
+        type_is_not_a_member_pointer>;
+
+namespace detail {
+
+    template<typename T, typename = std::false_type>
+    struct class_of_impl {};
+
+    template<typename T>
+    struct class_of_impl <T, typename std::is_same<
+        class_of_t<T>, detail::dummy>::type>
+    {
+        using type = class_of_t<T>;
+    };
+}
+
+//->
+
+template<typename T>
+struct class_of : detail::class_of_impl<T> {};
+
+//<-
+}} // namespace boost::callable_traits
+//->
+
+/*`
+[heading Constraints]
+* `T` must be a member pointer
+
+[heading Behavior]
+* A substitution failure occurs if the constraints are violated.
+* The aliased type is the parent class of the member. In other words, if `T` is expanded to `U C::*`, the aliased type is `C`.
+
+[heading Input/Output Examples]
+[table
+    [[`T`]                              [`class_of_t<T>`]]
+    [[`int foo::*`]                     [`foo`]]
+    [[`void(foo::* const &)() const`]           [`foo`]]
+]
+
+[heading Example Program]
+[import ../example/class_of.cpp]
+[class_of]
+[endsect]
+*/
+//]
+
+#endif // #ifndef BOOST_CLBL_TRTS_class_of_HPP