#ifndef BOOST_MPL_AUX_MSVC_IS_CLASS_HPP_INCLUDED | |
#define BOOST_MPL_AUX_MSVC_IS_CLASS_HPP_INCLUDED | |
// Copyright Aleksey Gurtovoy 2002-2004 | |
// | |
// 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/mpl for documentation. | |
// $Id: msvc_is_class.hpp 49267 2008-10-11 06:19:02Z agurtovoy $ | |
// $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $ | |
// $Revision: 49267 $ | |
#include <boost/mpl/if.hpp> | |
#include <boost/mpl/bool.hpp> | |
#include <boost/mpl/aux_/type_wrapper.hpp> | |
#include <boost/mpl/aux_/yes_no.hpp> | |
#include <boost/type_traits/is_reference.hpp> | |
namespace boost { namespace mpl { namespace aux { | |
template< typename T > struct is_class_helper | |
{ | |
typedef int (T::* type)(); | |
}; | |
// MSVC 6.x-specific lightweight 'is_class' implementation; | |
// Distinguishing feature: does not instantiate the type being tested. | |
template< typename T > | |
struct msvc_is_class_impl | |
{ | |
template< typename U> | |
static yes_tag test(type_wrapper<U>*, /*typename*/ is_class_helper<U>::type = 0); | |
static no_tag test(void const volatile*, ...); | |
enum { value = sizeof(test((type_wrapper<T>*)0)) == sizeof(yes_tag) }; | |
typedef bool_<value> type; | |
}; | |
// agurt, 17/sep/04: have to check for 'is_reference' upfront to avoid ICEs in | |
// complex metaprograms | |
template< typename T > | |
struct msvc_is_class | |
: if_< | |
is_reference<T> | |
, false_ | |
, msvc_is_class_impl<T> | |
>::type | |
{ | |
}; | |
}}} | |
#endif // BOOST_MPL_AUX_MSVC_IS_CLASS_HPP_INCLUDED |