[857] | 1 | // (C) Copyright John Maddock 2000.
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| 2 | // Use, modification and distribution are subject to the Boost Software License,
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| 3 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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| 4 | // http://www.boost.org/LICENSE_1_0.txt).
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| 5 | //
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| 6 | // See http://www.boost.org/libs/type_traits for most recent version including documentation.
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| 7 |
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| 8 | #ifndef BOOST_TT_IS_POLYMORPHIC_HPP
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| 9 | #define BOOST_TT_IS_POLYMORPHIC_HPP
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| 10 |
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| 11 | #include <boost/type_traits/is_class.hpp>
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| 12 | #include <boost/type_traits/remove_cv.hpp>
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| 13 | // should be the last #include
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| 14 | #include "boost/type_traits/detail/bool_trait_def.hpp"
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| 15 | #include <boost/detail/workaround.hpp>
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| 16 |
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| 17 | namespace boost{
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| 18 | namespace detail{
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| 19 |
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| 20 | template <class T>
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| 21 | struct is_polymorphic_imp1
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| 22 | {
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| 23 | # if BOOST_WORKAROUND(__MWERKS__, <= 0x2407) // CWPro7 should return false always.
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| 24 | typedef char d1, (&d2)[2];
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| 25 | # else
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| 26 | typedef typename remove_cv<T>::type ncvT;
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| 27 | struct d1 : public ncvT
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| 28 | {
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| 29 | d1();
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| 30 | # if !defined(__GNUC__) // this raises warnings with some classes, and buys nothing with GCC
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| 31 | ~d1()throw();
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| 32 | # endif
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| 33 | char padding[256];
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| 34 | };
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| 35 | struct d2 : public ncvT
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| 36 | {
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| 37 | d2();
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| 38 | virtual ~d2()throw();
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| 39 | # if !defined(BOOST_MSVC) && !defined(__ICL)
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| 40 | // for some reason this messes up VC++ when T has virtual bases,
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| 41 | // probably likewise for compilers that use the same ABI:
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| 42 | struct unique{};
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| 43 | virtual void unique_name_to_boost5487629(unique*);
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| 44 | # endif
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| 45 | char padding[256];
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| 46 | };
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| 47 | # endif
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| 48 | BOOST_STATIC_CONSTANT(bool, value = (sizeof(d2) == sizeof(d1)));
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| 49 | };
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| 50 |
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| 51 | template <class T>
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| 52 | struct is_polymorphic_imp2
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| 53 | {
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| 54 | BOOST_STATIC_CONSTANT(bool, value = false);
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| 55 | };
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| 56 |
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| 57 | template <bool is_class>
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| 58 | struct is_polymorphic_selector
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| 59 | {
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| 60 | template <class T>
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| 61 | struct rebind
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| 62 | {
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| 63 | typedef is_polymorphic_imp2<T> type;
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| 64 | };
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| 65 | };
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| 66 |
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| 67 | template <>
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| 68 | struct is_polymorphic_selector<true>
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| 69 | {
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| 70 | template <class T>
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| 71 | struct rebind
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| 72 | {
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| 73 | typedef is_polymorphic_imp1<T> type;
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| 74 | };
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| 75 | };
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| 76 |
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| 77 | template <class T>
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| 78 | struct is_polymorphic_imp
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| 79 | {
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| 80 | typedef is_polymorphic_selector< ::boost::is_class<T>::value> selector;
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| 81 | typedef typename selector::template rebind<T> binder;
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| 82 | typedef typename binder::type imp_type;
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| 83 | BOOST_STATIC_CONSTANT(bool, value = imp_type::value);
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| 84 | };
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| 85 |
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| 86 | } // namespace detail
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| 87 |
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| 88 | BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_polymorphic,T,::boost::detail::is_polymorphic_imp<T>::value)
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| 89 |
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| 90 | } // namespace boost
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| 91 |
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| 92 | #include "boost/type_traits/detail/bool_trait_undef.hpp"
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| 93 |
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| 94 | #endif
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