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// (C) Copyright John Maddock 2000. // Use, modification and distribution are subject to 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/type_traits for most recent version including documentation. #ifndef BOOST_TT_IS_POLYMORPHIC_HPP #define BOOST_TT_IS_POLYMORPHIC_HPP #include
#include
// should be the last #include #include
#include
namespace boost{ namespace detail{ template
struct is_polymorphic_imp1 { # if BOOST_WORKAROUND(__MWERKS__, <= 0x2407) // CWPro7 should return false always. typedef char d1, (&d2)[2]; # else typedef typename remove_cv
::type ncvT; struct d1 : public ncvT { d1(); # if !defined(__GNUC__) // this raises warnings with some classes, and buys nothing with GCC ~d1()throw(); # endif char padding[256]; private: // keep some picky compilers happy: d1(const d1&); d1& operator=(const d1&); }; struct d2 : public ncvT { d2(); virtual ~d2()throw(); # if !defined(BOOST_MSVC) && !defined(__ICL) // for some reason this messes up VC++ when T has virtual bases, // probably likewise for compilers that use the same ABI: struct unique{}; virtual void unique_name_to_boost5487629(unique*); # endif char padding[256]; private: // keep some picky compilers happy: d2(const d2&); d2& operator=(const d2&); }; # endif BOOST_STATIC_CONSTANT(bool, value = (sizeof(d2) == sizeof(d1))); }; template
struct is_polymorphic_imp2 { BOOST_STATIC_CONSTANT(bool, value = false); }; template
struct is_polymorphic_selector { template
struct rebind { typedef is_polymorphic_imp2
type; }; }; template <> struct is_polymorphic_selector
{ template
struct rebind { typedef is_polymorphic_imp1
type; }; }; template
struct is_polymorphic_imp { typedef is_polymorphic_selector< ::boost::is_class
::value> selector; typedef typename selector::template rebind
binder; typedef typename binder::type imp_type; BOOST_STATIC_CONSTANT(bool, value = imp_type::value); }; } // namespace detail BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_polymorphic,T,::boost::detail::is_polymorphic_imp
::value) } // namespace boost #include
#endif
is_polymorphic.hpp
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