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#ifndef BOOST_MPL_HAS_XXX_HPP_INCLUDED
#define BOOST_MPL_HAS_XXX_HPP_INCLUDED
// Copyright Aleksey Gurtovoy 2002-2006
// Copyright David Abrahams 2002-2003
// Copyright Daniel Walker 2007
//
// 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: has_xxx.hpp 64146 2010-07-19 00:46:31Z djwalker $
// $Date: 2010-07-18 20:46:31 -0400 (Sun, 18 Jul 2010) $
// $Revision: 64146 $
#include <boost/mpl/bool.hpp>
#include <boost/mpl/aux_/na_spec.hpp>
#include <boost/mpl/aux_/type_wrapper.hpp>
#include <boost/mpl/aux_/yes_no.hpp>
#include <boost/mpl/aux_/config/gcc.hpp>
#include <boost/mpl/aux_/config/has_xxx.hpp>
#include <boost/mpl/aux_/config/msvc_typename.hpp>
#include <boost/mpl/aux_/config/msvc.hpp>
#include <boost/mpl/aux_/config/static_constant.hpp>
#include <boost/mpl/aux_/config/workaround.hpp>
#include <boost/preprocessor/array/elem.hpp>
#include <boost/preprocessor/cat.hpp>
#include <boost/preprocessor/control/if.hpp>
#include <boost/preprocessor/repetition/enum_params.hpp>
#include <boost/preprocessor/repetition/enum_trailing_params.hpp>
#if BOOST_WORKAROUND( __BORLANDC__, BOOST_TESTED_AT(0x590) )
# include <boost/type_traits/is_class.hpp>
#endif
#if !defined(BOOST_MPL_CFG_NO_HAS_XXX)
# if BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
// agurt, 11/sep/02: MSVC-specific version (< 7.1), based on a USENET
// newsgroup's posting by John Madsen (comp.lang.c++.moderated,
// 1999-11-12 19:17:06 GMT); the code is _not_ standard-conforming, but
// it works way more reliably than the SFINAE-based implementation
// Modified dwa 8/Oct/02 to handle reference types.
# include <boost/mpl/if.hpp>
# include <boost/mpl/bool.hpp>
namespace boost { namespace mpl { namespace aux {
struct has_xxx_tag;
#if BOOST_WORKAROUND(BOOST_MSVC, == 1300)
template< typename U > struct msvc_incomplete_array
{
typedef char (&type)[sizeof(U) + 1];
};
#endif
template< typename T >
struct msvc_is_incomplete
{
// MSVC is capable of some kinds of SFINAE. If U is an incomplete
// type, it won't pick the second overload
static char tester(...);
#if BOOST_WORKAROUND(BOOST_MSVC, == 1300)
template< typename U >
static typename msvc_incomplete_array<U>::type tester(type_wrapper<U>);
#else
template< typename U >
static char (& tester(type_wrapper<U>) )[sizeof(U)+1];
#endif
BOOST_STATIC_CONSTANT(bool, value =
sizeof(tester(type_wrapper<T>())) == 1
);
};
template<>
struct msvc_is_incomplete<int>
{
BOOST_STATIC_CONSTANT(bool, value = false);
};
}}}
# define BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF_(trait, name, default_) \
template< typename T, typename name = ::boost::mpl::aux::has_xxx_tag > \
struct BOOST_PP_CAT(trait,_impl) : T \
{ \
static boost::mpl::aux::no_tag \
test(void(*)(::boost::mpl::aux::has_xxx_tag)); \
\
static boost::mpl::aux::yes_tag test(...); \
\
BOOST_STATIC_CONSTANT(bool, value = \
sizeof(test(static_cast<void(*)(name)>(0))) \
!= sizeof(boost::mpl::aux::no_tag) \
); \
typedef boost::mpl::bool_<value> type; \
}; \
\
template< typename T, typename fallback_ = boost::mpl::bool_<default_> > \
struct trait \
: boost::mpl::if_c< \
boost::mpl::aux::msvc_is_incomplete<T>::value \
, boost::mpl::bool_<false> \
, BOOST_PP_CAT(trait,_impl)<T> \
>::type \
{ \
}; \
\
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, void) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, bool) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, char) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, signed char) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, unsigned char) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, signed short) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, unsigned short) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, signed int) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, unsigned int) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, signed long) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, unsigned long) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, float) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, double) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, long double) \
/**/
# define BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, T) \
template<> struct trait<T> \
{ \
BOOST_STATIC_CONSTANT(bool, value = false); \
typedef boost::mpl::bool_<false> type; \
}; \
/**/
#if !defined(BOOST_NO_INTRINSIC_WCHAR_T)
# define BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(trait, name, unused) \
BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF_(trait, name, unused) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, wchar_t) \
/**/
#else
# define BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(trait, name, unused) \
BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF_(trait, name, unused) \
/**/
#endif
// SFINAE-based implementations below are derived from a USENET newsgroup's
// posting by Rani Sharoni (comp.lang.c++.moderated, 2002-03-17 07:45:09 PST)
# elif BOOST_WORKAROUND(BOOST_MSVC, BOOST_TESTED_AT(1400)) \
|| BOOST_WORKAROUND(__IBMCPP__, <= 700)
// MSVC 7.1+ & VACPP
// agurt, 15/jun/05: replace overload-based SFINAE implementation with SFINAE
// applied to partial specialization to fix some apparently random failures
// (thanks to Daniel Wallin for researching this!)
# define BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(trait, name, default_) \
template< typename T > \
struct BOOST_PP_CAT(trait, _msvc_sfinae_helper) \
{ \
typedef void type; \
};\
\
template< typename T, typename U = void > \
struct BOOST_PP_CAT(trait,_impl_) \
{ \
BOOST_STATIC_CONSTANT(bool, value = false); \
typedef boost::mpl::bool_<value> type; \
}; \
\
template< typename T > \
struct BOOST_PP_CAT(trait,_impl_)< \
T \
, typename BOOST_PP_CAT(trait, _msvc_sfinae_helper)< typename T::name >::type \
> \
{ \
BOOST_STATIC_CONSTANT(bool, value = true); \
typedef boost::mpl::bool_<value> type; \
}; \
\
template< typename T, typename fallback_ = boost::mpl::bool_<default_> > \
struct trait \
: BOOST_PP_CAT(trait,_impl_)<T> \
{ \
}; \
/**/
# elif BOOST_WORKAROUND( __BORLANDC__, BOOST_TESTED_AT(0x590) )
# define BOOST_MPL_HAS_XXX_TRAIT_NAMED_BCB_DEF(trait, trait_tester, name, default_) \
template< typename T, bool IS_CLASS > \
struct trait_tester \
{ \
BOOST_STATIC_CONSTANT( bool, value = false ); \
}; \
template< typename T > \
struct trait_tester< T, true > \
{ \
struct trait_tester_impl \
{ \
template < class U > \
static int resolve( boost::mpl::aux::type_wrapper<U> const volatile * \
, boost::mpl::aux::type_wrapper<typename U::name >* = 0 ); \
static char resolve( ... ); \
}; \
typedef boost::mpl::aux::type_wrapper<T> t_; \
BOOST_STATIC_CONSTANT( bool, value = ( sizeof( trait_tester_impl::resolve( static_cast< t_ * >(0) ) ) == sizeof(int) ) ); \
}; \
template< typename T, typename fallback_ = boost::mpl::bool_<default_> > \
struct trait \
{ \
BOOST_STATIC_CONSTANT( bool, value = (trait_tester< T, boost::is_class< T >::value >::value) ); \
typedef boost::mpl::bool_< trait< T, fallback_ >::value > type; \
};
# define BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(trait, name, default_) \
BOOST_MPL_HAS_XXX_TRAIT_NAMED_BCB_DEF( trait \
, BOOST_PP_CAT(trait,_tester) \
, name \
, default_ ) \
/**/
# else // other SFINAE-capable compilers
# define BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(trait, name, default_) \
template< typename T, typename fallback_ = boost::mpl::bool_<default_> > \
struct trait \
{ \
struct gcc_3_2_wknd \
{ \
template< typename U > \
static boost::mpl::aux::yes_tag test( \
boost::mpl::aux::type_wrapper<U> const volatile* \
, boost::mpl::aux::type_wrapper<BOOST_MSVC_TYPENAME U::name>* = 0 \
); \
\
static boost::mpl::aux::no_tag test(...); \
}; \
\
typedef boost::mpl::aux::type_wrapper<T> t_; \
BOOST_STATIC_CONSTANT(bool, value = \
sizeof(gcc_3_2_wknd::test(static_cast<t_*>(0))) \
== sizeof(boost::mpl::aux::yes_tag) \
); \
typedef boost::mpl::bool_<value> type; \
}; \
/**/
# endif // BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
#else // BOOST_MPL_CFG_NO_HAS_XXX
// placeholder implementation
# define BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(trait, name, default_) \
template< typename T, typename fallback_ = boost::mpl::bool_<default_> > \
struct trait \
{ \
BOOST_STATIC_CONSTANT(bool, value = fallback_::value); \
typedef fallback_ type; \
}; \
/**/
#endif
#define BOOST_MPL_HAS_XXX_TRAIT_DEF(name) \
BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(BOOST_PP_CAT(has_,name), name, false) \
/**/
#if !defined(BOOST_MPL_CFG_NO_HAS_XXX_TEMPLATE)
// Create a boolean Metafunction to detect a nested template
// member. This implementation is based on a USENET newsgroup's
// posting by Aleksey Gurtovoy (comp.lang.c++.moderated, 2002-03-19),
// Rani Sharoni's USENET posting cited above, the non-template has_xxx
// implementations above, and discussion on the Boost mailing list.
# if !defined(BOOST_MPL_HAS_XXX_NO_WRAPPED_TYPES)
# if BOOST_WORKAROUND(BOOST_MSVC, <= 1400)
# define BOOST_MPL_HAS_XXX_NO_WRAPPED_TYPES 1
# endif
# endif
# if !defined(BOOST_MPL_HAS_XXX_NO_EXPLICIT_TEST_FUNCTION)
# if (defined(BOOST_NO_EXPLICIT_FUNCTION_TEMPLATE_ARGUMENTS))
# define BOOST_MPL_HAS_XXX_NO_EXPLICIT_TEST_FUNCTION 1
# endif
# endif
# if !defined(BOOST_MPL_HAS_XXX_NEEDS_TEMPLATE_SFINAE)
# if BOOST_WORKAROUND(BOOST_MSVC, <= 1400)
# define BOOST_MPL_HAS_XXX_NEEDS_TEMPLATE_SFINAE 1
# endif
# endif
// NOTE: Many internal implementation macros take a Boost.Preprocessor
// array argument called args which is of the following form.
// ( 4, ( trait, name, max_arity, default_ ) )
# define BOOST_MPL_HAS_MEMBER_INTROSPECTION_NAME(args) \
BOOST_PP_CAT(BOOST_PP_ARRAY_ELEM(0, args) , _introspect) \
/**/
# define BOOST_MPL_HAS_MEMBER_INTROSPECTION_SUBSTITUTE_NAME(args, n) \
BOOST_PP_CAT(BOOST_PP_CAT(BOOST_PP_ARRAY_ELEM(0, args) , _substitute), n) \
/**/
# define BOOST_MPL_HAS_MEMBER_INTROSPECTION_TEST_NAME(args) \
BOOST_PP_CAT(BOOST_PP_ARRAY_ELEM(0, args) , _test) \
/**/
// Thanks to Guillaume Melquiond for pointing out the need for the
// "substitute" template as an argument to the overloaded test
// functions to get SFINAE to work for member templates with the
// correct name but different number of arguments.
# define BOOST_MPL_HAS_MEMBER_MULTI_SUBSTITUTE(z, n, args) \
template< \
template< BOOST_PP_ENUM_PARAMS(BOOST_PP_INC(n), typename V) > class V \
> \
struct BOOST_MPL_HAS_MEMBER_INTROSPECTION_SUBSTITUTE_NAME(args, n) { \
}; \
/**/
# define BOOST_MPL_HAS_MEMBER_SUBSTITUTE(args, substitute_macro) \
BOOST_PP_REPEAT( \
BOOST_PP_ARRAY_ELEM(2, args) \
, BOOST_MPL_HAS_MEMBER_MULTI_SUBSTITUTE \
, args \
) \
/**/
# if !BOOST_MPL_HAS_XXX_NO_EXPLICIT_TEST_FUNCTION
# define BOOST_MPL_HAS_MEMBER_REJECT(args, member_macro) \
template< typename V > \
static boost::mpl::aux::no_tag \
BOOST_MPL_HAS_MEMBER_INTROSPECTION_TEST_NAME(args)(...); \
/**/
# else
# define BOOST_MPL_HAS_MEMBER_REJECT(args, member_macro) \
static boost::mpl::aux::no_tag \
BOOST_MPL_HAS_MEMBER_INTROSPECTION_TEST_NAME(args)(...); \
/**/
# endif
# if !BOOST_MPL_HAS_XXX_NO_WRAPPED_TYPES
# define BOOST_MPL_HAS_MEMBER_MULTI_ACCEPT(z, n, args) \
template< typename V > \
static boost::mpl::aux::yes_tag \
BOOST_MPL_HAS_MEMBER_INTROSPECTION_TEST_NAME(args)( \
boost::mpl::aux::type_wrapper< V > const volatile* \
, BOOST_MPL_HAS_MEMBER_INTROSPECTION_SUBSTITUTE_NAME(args, n) < \
V::template BOOST_PP_ARRAY_ELEM(1, args) \
>* = 0 \
); \
/**/
# define BOOST_MPL_HAS_MEMBER_ACCEPT(args, member_macro) \
BOOST_PP_REPEAT( \
BOOST_PP_ARRAY_ELEM(2, args) \
, BOOST_MPL_HAS_MEMBER_MULTI_ACCEPT \
, args \
) \
/**/
# else
# define BOOST_MPL_HAS_MEMBER_ACCEPT(args, member_macro) \
template< typename V > \
static boost::mpl::aux::yes_tag \
BOOST_MPL_HAS_MEMBER_INTROSPECTION_TEST_NAME(args)( \
V const volatile* \
, member_macro(args, V, T)* = 0 \
); \
/**/
# endif
# if !BOOST_MPL_HAS_XXX_NO_EXPLICIT_TEST_FUNCTION
# define BOOST_MPL_HAS_MEMBER_TEST(args) \
sizeof(BOOST_MPL_HAS_MEMBER_INTROSPECTION_TEST_NAME(args)< U >(0)) \
== sizeof(boost::mpl::aux::yes_tag) \
/**/
# else
# if !BOOST_MPL_HAS_XXX_NO_WRAPPED_TYPES
# define BOOST_MPL_HAS_MEMBER_TEST(args) \
sizeof( \
BOOST_MPL_HAS_MEMBER_INTROSPECTION_TEST_NAME(args)( \
static_cast< boost::mpl::aux::type_wrapper< U >* >(0) \
) \
) == sizeof(boost::mpl::aux::yes_tag) \
/**/
# else
# define BOOST_MPL_HAS_MEMBER_TEST(args) \
sizeof( \
BOOST_MPL_HAS_MEMBER_INTROSPECTION_TEST_NAME(args)( \
static_cast< U* >(0) \
) \
) == sizeof(boost::mpl::aux::yes_tag) \
/**/
# endif
# endif
# define BOOST_MPL_HAS_MEMBER_INTROSPECT( \
args, substitute_macro, member_macro \
) \
template< typename U > \
struct BOOST_MPL_HAS_MEMBER_INTROSPECTION_NAME(args) { \
BOOST_MPL_HAS_MEMBER_SUBSTITUTE(args, substitute_macro) \
BOOST_MPL_HAS_MEMBER_REJECT(args, member_macro) \
BOOST_MPL_HAS_MEMBER_ACCEPT(args, member_macro) \
BOOST_STATIC_CONSTANT( \
bool, value = BOOST_MPL_HAS_MEMBER_TEST(args) \
); \
typedef boost::mpl::bool_< value > type; \
}; \
/**/
# define BOOST_MPL_HAS_MEMBER_IMPLEMENTATION( \
args, introspect_macro, substitute_macro, member_macro \
) \
template< \
typename T \
, typename fallback_ \
= boost::mpl::bool_< BOOST_PP_ARRAY_ELEM(3, args) > \
> \
class BOOST_PP_ARRAY_ELEM(0, args) { \
introspect_macro(args, substitute_macro, member_macro) \
public: \
static const bool value \
= BOOST_MPL_HAS_MEMBER_INTROSPECTION_NAME(args)< T >::value; \
typedef typename BOOST_MPL_HAS_MEMBER_INTROSPECTION_NAME(args)< \
T \
>::type type; \
}; \
/**/
// BOOST_MPL_HAS_MEMBER_WITH_FUNCTION_SFINAE expands to the full
// implementation of the function-based metafunction. Compile with -E
// to see the preprocessor output for this macro.
# define BOOST_MPL_HAS_MEMBER_WITH_FUNCTION_SFINAE( \
args, substitute_macro, member_macro \
) \
BOOST_MPL_HAS_MEMBER_IMPLEMENTATION( \
args \
, BOOST_MPL_HAS_MEMBER_INTROSPECT \
, substitute_macro \
, member_macro \
) \
/**/
# if BOOST_MPL_HAS_XXX_NEEDS_TEMPLATE_SFINAE
# if !defined(BOOST_MPL_HAS_XXX_NEEDS_NAMESPACE_LEVEL_SUBSTITUTE)
# if BOOST_WORKAROUND(BOOST_MSVC, <= 1400)
# define BOOST_MPL_HAS_XXX_NEEDS_NAMESPACE_LEVEL_SUBSTITUTE 1
# endif
# endif
# if !BOOST_MPL_HAS_XXX_NEEDS_NAMESPACE_LEVEL_SUBSTITUTE
# define BOOST_MPL_HAS_MEMBER_INTROSPECTION_SUBSTITUTE_NAME_WITH_TEMPLATE_SFINAE( \
args, n \
) \
BOOST_MPL_HAS_MEMBER_INTROSPECTION_SUBSTITUTE_NAME(args, n) \
/**/
# else
# define BOOST_MPL_HAS_MEMBER_INTROSPECTION_SUBSTITUTE_NAME_WITH_TEMPLATE_SFINAE( \
args, n \
) \
BOOST_PP_CAT( \
boost_mpl_has_xxx_ \
, BOOST_MPL_HAS_MEMBER_INTROSPECTION_SUBSTITUTE_NAME(args, n) \
) \
/**/
# endif
# define BOOST_MPL_HAS_MEMBER_INTROSPECTION_SUBSTITUTE_TAG_NAME( \
args \
) \
BOOST_PP_CAT( \
BOOST_MPL_HAS_MEMBER_INTROSPECTION_SUBSTITUTE_NAME_WITH_TEMPLATE_SFINAE( \
args, 0 \
) \
, _tag \
) \
/**/
# define BOOST_MPL_HAS_MEMBER_MULTI_SUBSTITUTE_WITH_TEMPLATE_SFINAE( \
z, n, args \
) \
template< \
template< BOOST_PP_ENUM_PARAMS(BOOST_PP_INC(n), typename U) > class U \
> \
struct BOOST_MPL_HAS_MEMBER_INTROSPECTION_SUBSTITUTE_NAME_WITH_TEMPLATE_SFINAE( \
args, n \
) { \
typedef \
BOOST_MPL_HAS_MEMBER_INTROSPECTION_SUBSTITUTE_TAG_NAME(args) \
type; \
}; \
/**/
# define BOOST_MPL_HAS_MEMBER_SUBSTITUTE_WITH_TEMPLATE_SFINAE( \
args, substitute_macro \
) \
typedef void \
BOOST_MPL_HAS_MEMBER_INTROSPECTION_SUBSTITUTE_TAG_NAME(args); \
BOOST_PP_REPEAT( \
BOOST_PP_ARRAY_ELEM(2, args) \
, BOOST_MPL_HAS_MEMBER_MULTI_SUBSTITUTE_WITH_TEMPLATE_SFINAE \
, args \
) \
/**/
# define BOOST_MPL_HAS_MEMBER_REJECT_WITH_TEMPLATE_SFINAE( \
args, member_macro \
) \
template< \
typename U \
, typename V \
= BOOST_MPL_HAS_MEMBER_INTROSPECTION_SUBSTITUTE_TAG_NAME(args) \
> \
struct BOOST_MPL_HAS_MEMBER_INTROSPECTION_TEST_NAME(args) { \
BOOST_STATIC_CONSTANT(bool, value = false); \
typedef boost::mpl::bool_< value > type; \
}; \
/**/
# define BOOST_MPL_HAS_MEMBER_MULTI_ACCEPT_WITH_TEMPLATE_SFINAE( \
z, n, args \
) \
template< typename U > \
struct BOOST_MPL_HAS_MEMBER_INTROSPECTION_TEST_NAME(args)< \
U \
, typename \
BOOST_MPL_HAS_MEMBER_INTROSPECTION_SUBSTITUTE_NAME_WITH_TEMPLATE_SFINAE( \
args, n \
)< \
BOOST_MSVC_TYPENAME U::BOOST_PP_ARRAY_ELEM(1, args)< > \
>::type \
> { \
BOOST_STATIC_CONSTANT(bool, value = true); \
typedef boost::mpl::bool_< value > type; \
}; \
/**/
# define BOOST_MPL_HAS_MEMBER_ACCEPT_WITH_TEMPLATE_SFINAE( \
args, member_macro \
) \
BOOST_PP_REPEAT( \
BOOST_PP_ARRAY_ELEM(2, args) \
, BOOST_MPL_HAS_MEMBER_MULTI_ACCEPT_WITH_TEMPLATE_SFINAE \
, args \
) \
/**/
# define BOOST_MPL_HAS_MEMBER_INTROSPECT_WITH_TEMPLATE_SFINAE( \
args, substitute_macro, member_macro \
) \
BOOST_MPL_HAS_MEMBER_REJECT_WITH_TEMPLATE_SFINAE(args, member_macro) \
BOOST_MPL_HAS_MEMBER_ACCEPT_WITH_TEMPLATE_SFINAE(args, member_macro) \
template< typename U > \
struct BOOST_MPL_HAS_MEMBER_INTROSPECTION_NAME(args) \
: BOOST_MPL_HAS_MEMBER_INTROSPECTION_TEST_NAME(args)< U > { \
}; \
/**/
// BOOST_MPL_HAS_MEMBER_WITH_TEMPLATE_SFINAE expands to the full
// implementation of the template-based metafunction. Compile with -E
// to see the preprocessor output for this macro.
//
// Note that if BOOST_MPL_HAS_XXX_NEEDS_NAMESPACE_LEVEL_SUBSTITUTE is
// defined BOOST_MPL_HAS_MEMBER_SUBSTITUTE_WITH_TEMPLATE_SFINAE needs
// to be expanded at namespace level before
// BOOST_MPL_HAS_MEMBER_WITH_TEMPLATE_SFINAE can be used.
# define BOOST_MPL_HAS_MEMBER_WITH_TEMPLATE_SFINAE( \
args, substitute_macro, member_macro \
) \
BOOST_MPL_HAS_MEMBER_SUBSTITUTE_WITH_TEMPLATE_SFINAE( \
args, substitute_macro \
) \
BOOST_MPL_HAS_MEMBER_IMPLEMENTATION( \
args \
, BOOST_MPL_HAS_MEMBER_INTROSPECT_WITH_TEMPLATE_SFINAE \
, substitute_macro \
, member_macro \
) \
/**/
# endif // BOOST_MPL_HAS_XXX_NEEDS_TEMPLATE_SFINAE
// Note: In the current implementation the parameter and access macros
// are no longer expanded.
# if !BOOST_WORKAROUND(BOOST_MSVC, <= 1400)
# define BOOST_MPL_HAS_XXX_TEMPLATE_NAMED_DEF(trait, name, default_) \
BOOST_MPL_HAS_MEMBER_WITH_FUNCTION_SFINAE( \
( 4, ( trait, name, BOOST_MPL_LIMIT_METAFUNCTION_ARITY, default_ ) ) \
, BOOST_MPL_HAS_MEMBER_TEMPLATE_SUBSTITUTE_PARAMETER \
, BOOST_MPL_HAS_MEMBER_TEMPLATE_ACCESS \
) \
/**/
# else
# define BOOST_MPL_HAS_XXX_TEMPLATE_NAMED_DEF(trait, name, default_) \
BOOST_MPL_HAS_MEMBER_WITH_TEMPLATE_SFINAE( \
( 4, ( trait, name, BOOST_MPL_LIMIT_METAFUNCTION_ARITY, default_ ) ) \
, BOOST_MPL_HAS_MEMBER_TEMPLATE_SUBSTITUTE_PARAMETER \
, BOOST_MPL_HAS_MEMBER_TEMPLATE_ACCESS \
) \
/**/
# endif
#else // BOOST_MPL_CFG_NO_HAS_XXX_TEMPLATE
// placeholder implementation
# define BOOST_MPL_HAS_XXX_TEMPLATE_NAMED_DEF(trait, name, default_) \
template< typename T \
, typename fallback_ = boost::mpl::bool_< default_ > > \
struct trait { \
BOOST_STATIC_CONSTANT(bool, value = fallback_::value); \
typedef fallback_ type; \
}; \
/**/
#endif // BOOST_MPL_CFG_NO_HAS_XXX_TEMPLATE
# define BOOST_MPL_HAS_XXX_TEMPLATE_DEF(name) \
BOOST_MPL_HAS_XXX_TEMPLATE_NAMED_DEF( \
BOOST_PP_CAT(has_, name), name, false \
) \
/**/
#endif // BOOST_MPL_HAS_XXX_HPP_INCLUDED
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