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648 lines
22 KiB
C++
648 lines
22 KiB
C++
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#ifndef BOOST_MPL_HAS_XXX_HPP_INCLUDED
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#define BOOST_MPL_HAS_XXX_HPP_INCLUDED
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// Copyright Aleksey Gurtovoy 2002-2006
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// Copyright David Abrahams 2002-2003
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// Copyright Daniel Walker 2007
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/mpl for documentation.
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// $Id$
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// $Date$
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// $Revision$
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#include <boost/mpl/bool.hpp>
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#include <boost/mpl/aux_/na_spec.hpp>
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#include <boost/mpl/aux_/type_wrapper.hpp>
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#include <boost/mpl/aux_/yes_no.hpp>
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#include <boost/mpl/aux_/config/gcc.hpp>
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#include <boost/mpl/aux_/config/has_xxx.hpp>
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#include <boost/mpl/aux_/config/msvc_typename.hpp>
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#include <boost/mpl/aux_/config/msvc.hpp>
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#include <boost/mpl/aux_/config/static_constant.hpp>
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#include <boost/mpl/aux_/config/workaround.hpp>
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#include <boost/preprocessor/array/elem.hpp>
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#include <boost/preprocessor/cat.hpp>
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#include <boost/preprocessor/control/if.hpp>
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#include <boost/preprocessor/repetition/enum_params.hpp>
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#include <boost/preprocessor/repetition/enum_trailing_params.hpp>
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#if BOOST_WORKAROUND( __BORLANDC__, BOOST_TESTED_AT(0x590) )
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# include <boost/type_traits/is_class.hpp>
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#endif
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#if !defined(BOOST_MPL_CFG_NO_HAS_XXX)
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# if BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
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// agurt, 11/sep/02: MSVC-specific version (< 7.1), based on a USENET
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// newsgroup's posting by John Madsen (comp.lang.c++.moderated,
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// 1999-11-12 19:17:06 GMT); the code is _not_ standard-conforming, but
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// it works way more reliably than the SFINAE-based implementation
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// Modified dwa 8/Oct/02 to handle reference types.
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# include <boost/mpl/if.hpp>
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# include <boost/mpl/bool.hpp>
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namespace boost { namespace mpl { namespace aux {
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struct has_xxx_tag;
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#if BOOST_WORKAROUND(BOOST_MSVC, == 1300)
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template< typename U > struct msvc_incomplete_array
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{
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typedef char (&type)[sizeof(U) + 1];
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};
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#endif
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template< typename T >
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struct msvc_is_incomplete
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{
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// MSVC is capable of some kinds of SFINAE. If U is an incomplete
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// type, it won't pick the second overload
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static char tester(...);
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#if BOOST_WORKAROUND(BOOST_MSVC, == 1300)
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template< typename U >
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static typename msvc_incomplete_array<U>::type tester(type_wrapper<U>);
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#else
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template< typename U >
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static char (& tester(type_wrapper<U>) )[sizeof(U)+1];
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#endif
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BOOST_STATIC_CONSTANT(bool, value =
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sizeof(tester(type_wrapper<T>())) == 1
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);
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};
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template<>
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struct msvc_is_incomplete<int>
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{
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BOOST_STATIC_CONSTANT(bool, value = false);
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};
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}}}
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# define BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF_(trait, name, default_) \
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template< typename T, typename name = ::boost::mpl::aux::has_xxx_tag > \
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struct BOOST_PP_CAT(trait,_impl) : T \
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{ \
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static boost::mpl::aux::no_tag \
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test(void(*)(::boost::mpl::aux::has_xxx_tag)); \
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\
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static boost::mpl::aux::yes_tag test(...); \
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\
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BOOST_STATIC_CONSTANT(bool, value = \
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sizeof(test(static_cast<void(*)(name)>(0))) \
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!= sizeof(boost::mpl::aux::no_tag) \
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); \
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typedef boost::mpl::bool_<value> type; \
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}; \
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\
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template< typename T, typename fallback_ = boost::mpl::bool_<default_> > \
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struct trait \
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: boost::mpl::if_c< \
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boost::mpl::aux::msvc_is_incomplete<T>::value \
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, boost::mpl::bool_<false> \
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, BOOST_PP_CAT(trait,_impl)<T> \
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>::type \
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{ \
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}; \
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\
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BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, void) \
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BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, bool) \
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BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, char) \
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BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, signed char) \
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BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, unsigned char) \
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BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, signed short) \
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BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, unsigned short) \
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BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, signed int) \
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BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, unsigned int) \
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BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, signed long) \
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BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, unsigned long) \
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BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, float) \
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BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, double) \
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BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, long double) \
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/**/
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# define BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, T) \
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template<> struct trait<T> \
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{ \
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BOOST_STATIC_CONSTANT(bool, value = false); \
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typedef boost::mpl::bool_<false> type; \
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}; \
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/**/
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#if !defined(BOOST_NO_INTRINSIC_WCHAR_T)
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# define BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(trait, name, unused) \
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BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF_(trait, name, unused) \
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BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, wchar_t) \
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/**/
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#else
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# define BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(trait, name, unused) \
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BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF_(trait, name, unused) \
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/**/
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#endif
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// SFINAE-based implementations below are derived from a USENET newsgroup's
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// posting by Rani Sharoni (comp.lang.c++.moderated, 2002-03-17 07:45:09 PST)
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# elif BOOST_WORKAROUND(BOOST_MSVC, <= 1400) \
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|| (BOOST_WORKAROUND(BOOST_MSVC, BOOST_TESTED_AT(1800)) && defined(__CUDACC__)) \
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|| BOOST_WORKAROUND(__IBMCPP__, <= 700)
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// MSVC 7.1 & MSVC 8.0 & VACPP
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// agurt, 15/jun/05: replace overload-based SFINAE implementation with SFINAE
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// applied to partial specialization to fix some apparently random failures
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// (thanks to Daniel Wallin for researching this!)
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# define BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(trait, name, default_) \
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template< typename T > \
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struct BOOST_PP_CAT(trait, _msvc_sfinae_helper) \
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{ \
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typedef void type; \
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};\
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\
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template< typename T, typename U = void > \
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struct BOOST_PP_CAT(trait,_impl_) \
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{ \
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BOOST_STATIC_CONSTANT(bool, value = false); \
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typedef boost::mpl::bool_<value> type; \
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}; \
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\
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template< typename T > \
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struct BOOST_PP_CAT(trait,_impl_)< \
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T \
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, typename BOOST_PP_CAT(trait, _msvc_sfinae_helper)< typename T::name >::type \
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> \
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{ \
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BOOST_STATIC_CONSTANT(bool, value = true); \
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typedef boost::mpl::bool_<value> type; \
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}; \
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\
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template< typename T, typename fallback_ = boost::mpl::bool_<default_> > \
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struct trait \
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: BOOST_PP_CAT(trait,_impl_)<T> \
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{ \
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}; \
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/**/
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# elif BOOST_WORKAROUND( __BORLANDC__, BOOST_TESTED_AT(0x590) )
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# define BOOST_MPL_HAS_XXX_TRAIT_NAMED_BCB_DEF(trait, trait_tester, name, default_) \
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template< typename T, bool IS_CLASS > \
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struct trait_tester \
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{ \
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BOOST_STATIC_CONSTANT( bool, value = false ); \
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}; \
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template< typename T > \
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struct trait_tester< T, true > \
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{ \
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struct trait_tester_impl \
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{ \
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template < class U > \
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static int resolve( boost::mpl::aux::type_wrapper<U> const volatile * \
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, boost::mpl::aux::type_wrapper<typename U::name >* = 0 ); \
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static char resolve( ... ); \
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}; \
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typedef boost::mpl::aux::type_wrapper<T> t_; \
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BOOST_STATIC_CONSTANT( bool, value = ( sizeof( trait_tester_impl::resolve( static_cast< t_ * >(0) ) ) == sizeof(int) ) ); \
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}; \
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template< typename T, typename fallback_ = boost::mpl::bool_<default_> > \
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struct trait \
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{ \
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BOOST_STATIC_CONSTANT( bool, value = (trait_tester< T, boost::is_class< T >::value >::value) ); \
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typedef boost::mpl::bool_< trait< T, fallback_ >::value > type; \
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};
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# define BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(trait, name, default_) \
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BOOST_MPL_HAS_XXX_TRAIT_NAMED_BCB_DEF( trait \
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, BOOST_PP_CAT(trait,_tester) \
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, name \
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, default_ ) \
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/**/
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# else // other SFINAE-capable compilers
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# define BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(trait, name, default_) \
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template< typename T, typename fallback_ = boost::mpl::bool_<default_> > \
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struct trait \
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{ \
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struct gcc_3_2_wknd \
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{ \
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template< typename U > \
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static boost::mpl::aux::yes_tag test( \
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boost::mpl::aux::type_wrapper<U> const volatile* \
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, boost::mpl::aux::type_wrapper<BOOST_MSVC_TYPENAME U::name>* = 0 \
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); \
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\
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static boost::mpl::aux::no_tag test(...); \
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}; \
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\
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typedef boost::mpl::aux::type_wrapper<T> t_; \
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BOOST_STATIC_CONSTANT(bool, value = \
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sizeof(gcc_3_2_wknd::test(static_cast<t_*>(0))) \
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== sizeof(boost::mpl::aux::yes_tag) \
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); \
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typedef boost::mpl::bool_<value> type; \
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}; \
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/**/
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# endif // BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
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#else // BOOST_MPL_CFG_NO_HAS_XXX
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// placeholder implementation
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# define BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(trait, name, default_) \
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template< typename T, typename fallback_ = boost::mpl::bool_<default_> > \
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struct trait \
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{ \
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BOOST_STATIC_CONSTANT(bool, value = fallback_::value); \
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typedef fallback_ type; \
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}; \
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/**/
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#endif
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#define BOOST_MPL_HAS_XXX_TRAIT_DEF(name) \
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BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(BOOST_PP_CAT(has_,name), name, false) \
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/**/
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#if !defined(BOOST_MPL_CFG_NO_HAS_XXX_TEMPLATE)
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// Create a boolean Metafunction to detect a nested template
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// member. This implementation is based on a USENET newsgroup's
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// posting by Aleksey Gurtovoy (comp.lang.c++.moderated, 2002-03-19),
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// Rani Sharoni's USENET posting cited above, the non-template has_xxx
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// implementations above, and discussion on the Boost mailing list.
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# if !defined(BOOST_MPL_HAS_XXX_NO_WRAPPED_TYPES)
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# if BOOST_WORKAROUND(BOOST_MSVC, <= 1400)
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# define BOOST_MPL_HAS_XXX_NO_WRAPPED_TYPES 1
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# else
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# define BOOST_MPL_HAS_XXX_NO_WRAPPED_TYPES 0
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# endif
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# endif
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# if !defined(BOOST_MPL_HAS_XXX_NO_EXPLICIT_TEST_FUNCTION)
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# if (defined(BOOST_NO_EXPLICIT_FUNCTION_TEMPLATE_ARGUMENTS))
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# define BOOST_MPL_HAS_XXX_NO_EXPLICIT_TEST_FUNCTION 1
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# else
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# define BOOST_MPL_HAS_XXX_NO_EXPLICIT_TEST_FUNCTION 0
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# endif
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# endif
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# if !defined(BOOST_MPL_HAS_XXX_NEEDS_TEMPLATE_SFINAE)
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# if BOOST_WORKAROUND(BOOST_MSVC, <= 1400)
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# define BOOST_MPL_HAS_XXX_NEEDS_TEMPLATE_SFINAE 1
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# else
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# define BOOST_MPL_HAS_XXX_NEEDS_TEMPLATE_SFINAE 0
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# endif
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# endif
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// NOTE: Many internal implementation macros take a Boost.Preprocessor
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// array argument called args which is of the following form.
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// ( 4, ( trait, name, max_arity, default_ ) )
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# define BOOST_MPL_HAS_MEMBER_INTROSPECTION_NAME(args) \
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BOOST_PP_CAT(BOOST_PP_ARRAY_ELEM(0, args) , _introspect) \
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/**/
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# define BOOST_MPL_HAS_MEMBER_INTROSPECTION_SUBSTITUTE_NAME(args, n) \
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BOOST_PP_CAT(BOOST_PP_CAT(BOOST_PP_ARRAY_ELEM(0, args) , _substitute), n) \
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/**/
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# define BOOST_MPL_HAS_MEMBER_INTROSPECTION_TEST_NAME(args) \
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BOOST_PP_CAT(BOOST_PP_ARRAY_ELEM(0, args) , _test) \
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/**/
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// Thanks to Guillaume Melquiond for pointing out the need for the
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// "substitute" template as an argument to the overloaded test
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// functions to get SFINAE to work for member templates with the
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// correct name but different number of arguments.
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# define BOOST_MPL_HAS_MEMBER_MULTI_SUBSTITUTE(z, n, args) \
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template< \
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template< BOOST_PP_ENUM_PARAMS(BOOST_PP_INC(n), typename V) > class V \
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> \
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struct BOOST_MPL_HAS_MEMBER_INTROSPECTION_SUBSTITUTE_NAME(args, n) { \
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}; \
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/**/
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# define BOOST_MPL_HAS_MEMBER_SUBSTITUTE(args, substitute_macro) \
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BOOST_PP_REPEAT( \
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BOOST_PP_ARRAY_ELEM(2, args) \
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, BOOST_MPL_HAS_MEMBER_MULTI_SUBSTITUTE \
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, args \
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) \
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/**/
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# if !BOOST_MPL_HAS_XXX_NO_EXPLICIT_TEST_FUNCTION
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# define BOOST_MPL_HAS_MEMBER_REJECT(args, member_macro) \
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template< typename V > \
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static boost::mpl::aux::no_tag \
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BOOST_MPL_HAS_MEMBER_INTROSPECTION_TEST_NAME(args)(...); \
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/**/
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# else
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# define BOOST_MPL_HAS_MEMBER_REJECT(args, member_macro) \
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static boost::mpl::aux::no_tag \
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BOOST_MPL_HAS_MEMBER_INTROSPECTION_TEST_NAME(args)(...); \
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/**/
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# endif
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# if !BOOST_MPL_HAS_XXX_NO_WRAPPED_TYPES
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# define BOOST_MPL_HAS_MEMBER_MULTI_ACCEPT(z, n, args) \
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template< typename V > \
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static boost::mpl::aux::yes_tag \
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BOOST_MPL_HAS_MEMBER_INTROSPECTION_TEST_NAME(args)( \
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boost::mpl::aux::type_wrapper< V > const volatile* \
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, BOOST_MPL_HAS_MEMBER_INTROSPECTION_SUBSTITUTE_NAME(args, n) < \
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V::template BOOST_PP_ARRAY_ELEM(1, args) \
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>* = 0 \
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); \
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/**/
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# define BOOST_MPL_HAS_MEMBER_ACCEPT(args, member_macro) \
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BOOST_PP_REPEAT( \
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BOOST_PP_ARRAY_ELEM(2, args) \
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, BOOST_MPL_HAS_MEMBER_MULTI_ACCEPT \
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, args \
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) \
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/**/
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# else
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# define BOOST_MPL_HAS_MEMBER_ACCEPT(args, member_macro) \
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template< typename V > \
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static boost::mpl::aux::yes_tag \
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BOOST_MPL_HAS_MEMBER_INTROSPECTION_TEST_NAME(args)( \
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V const volatile* \
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, member_macro(args, V, T)* = 0 \
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); \
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/**/
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# endif
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# if !BOOST_MPL_HAS_XXX_NO_EXPLICIT_TEST_FUNCTION
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# define BOOST_MPL_HAS_MEMBER_TEST(args) \
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sizeof(BOOST_MPL_HAS_MEMBER_INTROSPECTION_TEST_NAME(args)< U >(0)) \
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== sizeof(boost::mpl::aux::yes_tag) \
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/**/
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# else
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# if !BOOST_MPL_HAS_XXX_NO_WRAPPED_TYPES
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# define BOOST_MPL_HAS_MEMBER_TEST(args) \
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sizeof( \
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BOOST_MPL_HAS_MEMBER_INTROSPECTION_TEST_NAME(args)( \
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static_cast< boost::mpl::aux::type_wrapper< U >* >(0) \
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) \
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) == sizeof(boost::mpl::aux::yes_tag) \
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/**/
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# else
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# define BOOST_MPL_HAS_MEMBER_TEST(args) \
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sizeof( \
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BOOST_MPL_HAS_MEMBER_INTROSPECTION_TEST_NAME(args)( \
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static_cast< U* >(0) \
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) \
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) == sizeof(boost::mpl::aux::yes_tag) \
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/**/
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# endif
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# endif
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# define BOOST_MPL_HAS_MEMBER_INTROSPECT( \
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args, substitute_macro, member_macro \
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) \
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template< typename U > \
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struct BOOST_MPL_HAS_MEMBER_INTROSPECTION_NAME(args) { \
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BOOST_MPL_HAS_MEMBER_SUBSTITUTE(args, substitute_macro) \
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BOOST_MPL_HAS_MEMBER_REJECT(args, member_macro) \
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BOOST_MPL_HAS_MEMBER_ACCEPT(args, member_macro) \
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BOOST_STATIC_CONSTANT( \
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bool, value = BOOST_MPL_HAS_MEMBER_TEST(args) \
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); \
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typedef boost::mpl::bool_< value > type; \
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}; \
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/**/
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# define BOOST_MPL_HAS_MEMBER_IMPLEMENTATION( \
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args, introspect_macro, substitute_macro, member_macro \
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) \
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template< \
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typename T \
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, typename fallback_ \
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= boost::mpl::bool_< BOOST_PP_ARRAY_ELEM(3, args) > \
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> \
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class BOOST_PP_ARRAY_ELEM(0, args) { \
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introspect_macro(args, substitute_macro, member_macro) \
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public: \
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static const bool value \
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= BOOST_MPL_HAS_MEMBER_INTROSPECTION_NAME(args)< T >::value; \
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typedef typename BOOST_MPL_HAS_MEMBER_INTROSPECTION_NAME(args)< \
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T \
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>::type type; \
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}; \
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/**/
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|
// 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
|