2 #ifndef BOOST_MPL_IF_HPP_INCLUDED
3 #define BOOST_MPL_IF_HPP_INCLUDED
5 // Copyright Aleksey Gurtovoy 2000-2004
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)
11 // See http://www.boost.org/libs/mpl for documentation.
13 // $Id: if.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
14 // $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $
17 #include <boost/mpl/aux_/value_wknd.hpp>
18 #include <boost/mpl/aux_/static_cast.hpp>
19 #include <boost/mpl/aux_/na_spec.hpp>
20 #include <boost/mpl/aux_/lambda_support.hpp>
21 #include <boost/mpl/aux_/config/integral.hpp>
22 #include <boost/mpl/aux_/config/ctps.hpp>
23 #include <boost/mpl/aux_/config/workaround.hpp>
25 namespace boost
{ namespace mpl
{
27 #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
43 struct if_c
<false,T1
,T2
>
48 // agurt, 05/sep/04: nondescriptive parameter names for the sake of DigitalMars
49 // (and possibly MWCW < 8.0); see http://article.gmane.org/gmane.comp.lib.boost.devel/108959
51 typename
BOOST_MPL_AUX_NA_PARAM(T1
)
52 , typename
BOOST_MPL_AUX_NA_PARAM(T2
)
53 , typename
BOOST_MPL_AUX_NA_PARAM(T3
)
58 // agurt, 02/jan/03: two-step 'type' definition for the sake of aCC
60 #if defined(BOOST_MPL_CFG_BCC_INTEGRAL_CONSTANTS)
61 BOOST_MPL_AUX_VALUE_WKND(T1
)::value
63 BOOST_MPL_AUX_STATIC_CAST(bool, BOOST_MPL_AUX_VALUE_WKND(T1
)::value
)
70 typedef typename
almost_type_::type type
;
72 BOOST_MPL_AUX_LAMBDA_SUPPORT(3,if_
,(T1
,T2
,T3
))
77 // no partial class template specialization
84 template< typename T1
, typename T2
> struct result_
93 template< typename T1
, typename T2
> struct result_
108 typedef typename
aux::if_impl
< C_
>
109 ::template result_
<T1
,T2
>::type type
;
112 // (almost) copy & paste in order to save one more
113 // recursively nested template instantiation to user
115 typename
BOOST_MPL_AUX_NA_PARAM(C_
)
116 , typename
BOOST_MPL_AUX_NA_PARAM(T1
)
117 , typename
BOOST_MPL_AUX_NA_PARAM(T2
)
121 enum { msvc_wknd_
= BOOST_MPL_AUX_MSVC_VALUE_WKND(C_
)::value
};
123 typedef typename
aux::if_impl
< BOOST_MPL_AUX_STATIC_CAST(bool, msvc_wknd_
) >
124 ::template result_
<T1
,T2
>::type type
;
126 BOOST_MPL_AUX_LAMBDA_SUPPORT(3,if_
,(C_
,T1
,T2
))
129 #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
131 BOOST_MPL_AUX_NA_SPEC(3, if_
)
135 #endif // BOOST_MPL_IF_HPP_INCLUDED