[3408] | 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/intrinsics.hpp> |
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| 12 | #ifndef BOOST_IS_POLYMORPHIC |
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| 13 | #include <boost/type_traits/is_class.hpp> |
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| 14 | #include <boost/type_traits/remove_cv.hpp> |
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| 15 | #endif |
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| 16 | // should be the last #include |
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| 17 | #include <boost/type_traits/detail/bool_trait_def.hpp> |
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| 18 | #include <boost/detail/workaround.hpp> |
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| 19 | |
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| 20 | namespace boost{ |
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| 21 | |
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| 22 | #ifndef BOOST_IS_POLYMORPHIC |
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| 23 | |
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| 24 | namespace detail{ |
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| 25 | |
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| 26 | template <class T> |
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| 27 | struct is_polymorphic_imp1 |
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| 28 | { |
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| 29 | # if BOOST_WORKAROUND(__MWERKS__, <= 0x2407) // CWPro7 should return false always. |
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| 30 | typedef char d1, (&d2)[2]; |
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| 31 | # else |
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| 32 | typedef typename remove_cv<T>::type ncvT; |
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| 33 | struct d1 : public ncvT |
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| 34 | { |
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| 35 | d1(); |
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| 36 | # if !defined(__GNUC__) // this raises warnings with some classes, and buys nothing with GCC |
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| 37 | ~d1()throw(); |
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| 38 | # endif |
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| 39 | char padding[256]; |
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| 40 | private: |
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| 41 | // keep some picky compilers happy: |
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| 42 | d1(const d1&); |
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| 43 | d1& operator=(const d1&); |
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| 44 | }; |
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| 45 | struct d2 : public ncvT |
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| 46 | { |
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| 47 | d2(); |
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| 48 | virtual ~d2()throw(); |
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| 49 | # if !defined(BOOST_MSVC) && !defined(__ICL) |
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| 50 | // for some reason this messes up VC++ when T has virtual bases, |
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| 51 | // probably likewise for compilers that use the same ABI: |
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| 52 | struct unique{}; |
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| 53 | virtual void unique_name_to_boost5487629(unique*); |
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| 54 | # endif |
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| 55 | char padding[256]; |
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| 56 | private: |
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| 57 | // keep some picky compilers happy: |
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| 58 | d2(const d2&); |
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| 59 | d2& operator=(const d2&); |
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| 60 | }; |
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| 61 | # endif |
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| 62 | BOOST_STATIC_CONSTANT(bool, value = (sizeof(d2) == sizeof(d1))); |
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| 63 | }; |
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| 64 | |
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| 65 | template <class T> |
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| 66 | struct is_polymorphic_imp2 |
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| 67 | { |
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| 68 | BOOST_STATIC_CONSTANT(bool, value = false); |
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| 69 | }; |
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| 70 | |
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| 71 | template <bool is_class> |
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| 72 | struct is_polymorphic_selector |
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| 73 | { |
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| 74 | template <class T> |
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| 75 | struct rebind |
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| 76 | { |
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| 77 | typedef is_polymorphic_imp2<T> type; |
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| 78 | }; |
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| 79 | }; |
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| 80 | |
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| 81 | template <> |
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| 82 | struct is_polymorphic_selector<true> |
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| 83 | { |
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| 84 | template <class T> |
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| 85 | struct rebind |
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| 86 | { |
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| 87 | typedef is_polymorphic_imp1<T> type; |
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| 88 | }; |
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| 89 | }; |
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| 90 | |
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| 91 | template <class T> |
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| 92 | struct is_polymorphic_imp |
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| 93 | { |
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| 94 | typedef is_polymorphic_selector< ::boost::is_class<T>::value> selector; |
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| 95 | typedef typename selector::template rebind<T> binder; |
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| 96 | typedef typename binder::type imp_type; |
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| 97 | BOOST_STATIC_CONSTANT(bool, value = imp_type::value); |
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| 98 | }; |
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| 99 | |
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| 100 | } // namespace detail |
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| 101 | |
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| 102 | BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_polymorphic,T,::boost::detail::is_polymorphic_imp<T>::value) |
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| 103 | |
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| 104 | #else // BOOST_IS_POLYMORPHIC |
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| 105 | |
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| 106 | BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_polymorphic,T,BOOST_IS_POLYMORPHIC(T)) |
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| 107 | |
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| 108 | #endif |
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| 109 | |
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| 110 | } // namespace boost |
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| 111 | |
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| 112 | #include <boost/type_traits/detail/bool_trait_undef.hpp> |
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| 113 | |
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| 114 | #endif |
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