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Jeff Thompsona28eed82013-08-22 16:21:10 -07001
2#ifndef BOOST_MPL_AUX_MSVC_IS_CLASS_HPP_INCLUDED
3#define BOOST_MPL_AUX_MSVC_IS_CLASS_HPP_INCLUDED
4
5// Copyright Aleksey Gurtovoy 2002-2004
6//
7// Distributed under the Boost Software License, Version 1.0.
8// (See accompanying file LICENSE_1_0.txt or copy at
9// http://www.boost.org/LICENSE_1_0.txt)
10//
11// See http://www.boost.org/libs/mpl for documentation.
12
13// $Id: msvc_is_class.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
14// $Date: 2008-10-10 23:19:02 -0700 (Fri, 10 Oct 2008) $
15// $Revision: 49267 $
16
17#include <ndnboost/mpl/if.hpp>
18#include <ndnboost/mpl/bool.hpp>
19#include <ndnboost/mpl/aux_/type_wrapper.hpp>
20#include <ndnboost/mpl/aux_/yes_no.hpp>
21
22#include <ndnboost/type_traits/is_reference.hpp>
23
24namespace ndnboost { namespace mpl { namespace aux {
25
26template< typename T > struct is_class_helper
27{
28 typedef int (T::* type)();
29};
30
31// MSVC 6.x-specific lightweight 'is_class' implementation;
32// Distinguishing feature: does not instantiate the type being tested.
33template< typename T >
34struct msvc_is_class_impl
35{
36 template< typename U>
37 static yes_tag test(type_wrapper<U>*, /*typename*/ is_class_helper<U>::type = 0);
38 static no_tag test(void const volatile*, ...);
39
40 enum { value = sizeof(test((type_wrapper<T>*)0)) == sizeof(yes_tag) };
41 typedef bool_<value> type;
42};
43
44// agurt, 17/sep/04: have to check for 'is_reference' upfront to avoid ICEs in
45// complex metaprograms
46template< typename T >
47struct msvc_is_class
48 : if_<
49 is_reference<T>
50 , false_
51 , msvc_is_class_impl<T>
52 >::type
53{
54};
55
56}}}
57
58#endif // BOOST_MPL_AUX_MSVC_IS_CLASS_HPP_INCLUDED