#ifndef BOOST_MPL_IF_HPP_INCLUDED
#define BOOST_MPL_IF_HPP_INCLUDED
-// + file: boost/mpl/if.hpp
-// + last modified: 10/mar/03
-
-// Copyright (c) 2000-03 Boost.org
+// Copyright Aleksey Gurtovoy 2000-2004
//
-// Permission to use, copy, modify, distribute and sell this software
-// and its documentation for any purpose is hereby granted without fee,
-// provided that the above copyright notice appears in all copies and
-// that both the copyright notice and this permission notice appear in
-// supporting documentation. No representations are made about the
-// suitability of this software for any purpose. It is provided "as is"
-// without express or implied warranty.
+// 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.
-#include "boost/mpl/aux_/value_wknd.hpp"
-#include "boost/mpl/aux_/ice_cast.hpp"
-#include "boost/mpl/aux_/void_spec.hpp"
-#include "boost/mpl/aux_/lambda_support.hpp"
-#include "boost/mpl/aux_/config/workaround.hpp"
-#include "boost/config.hpp"
+// $Source$
+// $Date: 2004-09-07 10:53:22 +0200 (Tue, 07 Sep 2004) $
+// $Revision: 24947 $
+
+#include <boost/mpl/aux_/value_wknd.hpp>
+#include <boost/mpl/aux_/static_cast.hpp>
+#include <boost/mpl/aux_/na_spec.hpp>
+#include <boost/mpl/aux_/lambda_support.hpp>
+#include <boost/mpl/aux_/config/integral.hpp>
+#include <boost/mpl/aux_/config/ctps.hpp>
+#include <boost/mpl/aux_/config/workaround.hpp>
-namespace boost {
-namespace mpl {
+namespace boost { namespace mpl {
#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
typedef T2 type;
};
+// agurt, 05/sep/04: nondescriptive parameter names for the sake of DigitalMars
+// (and possibly MWCW < 8.0); see http://article.gmane.org/gmane.comp.lib.boost.devel/108959
template<
- typename BOOST_MPL_AUX_VOID_SPEC_PARAM(C)
- , typename BOOST_MPL_AUX_VOID_SPEC_PARAM(T1)
- , typename BOOST_MPL_AUX_VOID_SPEC_PARAM(T2)
+ typename BOOST_MPL_AUX_NA_PARAM(T1)
+ , typename BOOST_MPL_AUX_NA_PARAM(T2)
+ , typename BOOST_MPL_AUX_NA_PARAM(T3)
>
struct if_
{
private:
// agurt, 02/jan/03: two-step 'type' definition for the sake of aCC
typedef if_c<
-#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x561))
- BOOST_MPL_AUX_VALUE_WKND(C)::value
+#if defined(BOOST_MPL_CFG_BCC_INTEGRAL_CONSTANTS)
+ BOOST_MPL_AUX_VALUE_WKND(T1)::value
#else
- BOOST_MPL_AUX_ICE_CAST(bool, BOOST_MPL_AUX_VALUE_WKND(C)::value)
+ BOOST_MPL_AUX_STATIC_CAST(bool, BOOST_MPL_AUX_VALUE_WKND(T1)::value)
#endif
- , T1
, T2
+ , T3
> almost_type_;
public:
typedef typename almost_type_::type type;
- BOOST_MPL_AUX_LAMBDA_SUPPORT(3,if_,(C,T1,T2))
-};
-
-#elif defined(BOOST_MSVC) && (BOOST_MSVC <= 1300)
-
-// MSVC6.5-specific version
-
-template<
- bool C_
- , typename T1
- , typename T2
- >
-struct if_c
-{
- private:
- template<bool> struct answer { typedef T1 type; };
- template<> struct answer<false> { typedef T2 type; };
-
- public:
- typedef typename answer< C_ >::type type;
-};
-
-// (almost) copy & paste in order to save one more
-// recursively nested template instantiation to user
-template<
- typename C_
- , typename T1
- , typename T2
- >
-struct if_
-{
- private:
- template<bool> struct answer { typedef T1 type; };
- template<> struct answer<false> { typedef T2 type; };
-
- // agurt, 17/sep/02: in some situations MSVC 7.0 doesn't
- // handle 'answer<C::value>' expression very well
- enum { c_ = C_::value };
-
- public:
- typedef typename answer< BOOST_MPL_AUX_ICE_CAST(bool, c_) >::type type;
-
- BOOST_MPL_AUX_LAMBDA_SUPPORT(3,if_,(C_,T1,T2))
+ BOOST_MPL_AUX_LAMBDA_SUPPORT(3,if_,(T1,T2,T3))
};
#else
} // namespace aux
template<
- bool C
+ bool C_
, typename T1
, typename T2
>
struct if_c
{
- typedef typename aux::if_impl< C >
+ typedef typename aux::if_impl< C_ >
::template result_<T1,T2>::type type;
};
// (almost) copy & paste in order to save one more
// recursively nested template instantiation to user
template<
- typename BOOST_MPL_AUX_VOID_SPEC_PARAM(C)
- , typename BOOST_MPL_AUX_VOID_SPEC_PARAM(T1)
- , typename BOOST_MPL_AUX_VOID_SPEC_PARAM(T2)
+ typename BOOST_MPL_AUX_NA_PARAM(C_)
+ , typename BOOST_MPL_AUX_NA_PARAM(T1)
+ , typename BOOST_MPL_AUX_NA_PARAM(T2)
>
struct if_
{
- typedef typename aux::if_impl< BOOST_MPL_AUX_ICE_CAST(bool, C::value) >
+ enum { msvc_wknd_ = BOOST_MPL_AUX_MSVC_VALUE_WKND(C_)::value };
+
+ typedef typename aux::if_impl< BOOST_MPL_AUX_STATIC_CAST(bool, msvc_wknd_) >
::template result_<T1,T2>::type type;
- BOOST_MPL_AUX_LAMBDA_SUPPORT(3,if_,(C,T1,T2))
+ BOOST_MPL_AUX_LAMBDA_SUPPORT(3,if_,(C_,T1,T2))
};
#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
-BOOST_MPL_AUX_VOID_SPEC(3, if_)
+BOOST_MPL_AUX_NA_SPEC(3, if_)
-} // namespace mpl
-} // namespace boost
+}}
#endif // BOOST_MPL_IF_HPP_INCLUDED