Jeff Thompson | f7d4994 | 2013-08-01 16:47:40 -0700 | [diff] [blame] | 1 | // (C) Copyright John Maddock 2000. |
| 2 | // Use, modification and distribution are subject to the Boost Software License, |
| 3 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
| 4 | // http://www.boost.org/LICENSE_1_0.txt). |
| 5 | // |
| 6 | // See http://www.boost.org/libs/type_traits for most recent version including documentation. |
| 7 | |
| 8 | #ifndef BOOST_TT_IS_POLYMORPHIC_HPP |
| 9 | #define BOOST_TT_IS_POLYMORPHIC_HPP |
| 10 | |
Jeff Thompson | 2277ce5 | 2013-08-01 17:34:11 -0700 | [diff] [blame] | 11 | #include <ndnboost/type_traits/intrinsics.hpp> |
Jeff Thompson | f7d4994 | 2013-08-01 16:47:40 -0700 | [diff] [blame] | 12 | #ifndef BOOST_IS_POLYMORPHIC |
Jeff Thompson | 2277ce5 | 2013-08-01 17:34:11 -0700 | [diff] [blame] | 13 | #include <ndnboost/type_traits/is_class.hpp> |
| 14 | #include <ndnboost/type_traits/remove_cv.hpp> |
Jeff Thompson | f7d4994 | 2013-08-01 16:47:40 -0700 | [diff] [blame] | 15 | #endif |
| 16 | // should be the last #include |
Jeff Thompson | 2277ce5 | 2013-08-01 17:34:11 -0700 | [diff] [blame] | 17 | #include <ndnboost/type_traits/detail/bool_trait_def.hpp> |
| 18 | #include <ndnboost/detail/workaround.hpp> |
Jeff Thompson | f7d4994 | 2013-08-01 16:47:40 -0700 | [diff] [blame] | 19 | |
| 20 | namespace ndnboost{ |
| 21 | |
| 22 | #ifndef BOOST_IS_POLYMORPHIC |
| 23 | |
| 24 | namespace detail{ |
| 25 | |
| 26 | template <class T> |
| 27 | struct is_polymorphic_imp1 |
| 28 | { |
| 29 | # if BOOST_WORKAROUND(__MWERKS__, <= 0x2407) // CWPro7 should return false always. |
| 30 | typedef char d1, (&d2)[2]; |
| 31 | # else |
| 32 | typedef typename remove_cv<T>::type ncvT; |
| 33 | struct d1 : public ncvT |
| 34 | { |
| 35 | d1(); |
| 36 | # if !defined(__GNUC__) // this raises warnings with some classes, and buys nothing with GCC |
| 37 | ~d1()throw(); |
| 38 | # endif |
| 39 | char padding[256]; |
| 40 | private: |
| 41 | // keep some picky compilers happy: |
| 42 | d1(const d1&); |
| 43 | d1& operator=(const d1&); |
| 44 | }; |
| 45 | struct d2 : public ncvT |
| 46 | { |
| 47 | d2(); |
| 48 | virtual ~d2()throw(); |
| 49 | # if !defined(BOOST_MSVC) && !defined(__ICL) |
| 50 | // for some reason this messes up VC++ when T has virtual bases, |
| 51 | // probably likewise for compilers that use the same ABI: |
| 52 | struct unique{}; |
| 53 | virtual void unique_name_to_boost5487629(unique*); |
| 54 | # endif |
| 55 | char padding[256]; |
| 56 | private: |
| 57 | // keep some picky compilers happy: |
| 58 | d2(const d2&); |
| 59 | d2& operator=(const d2&); |
| 60 | }; |
| 61 | # endif |
| 62 | BOOST_STATIC_CONSTANT(bool, value = (sizeof(d2) == sizeof(d1))); |
| 63 | }; |
| 64 | |
| 65 | template <class T> |
| 66 | struct is_polymorphic_imp2 |
| 67 | { |
| 68 | BOOST_STATIC_CONSTANT(bool, value = false); |
| 69 | }; |
| 70 | |
| 71 | template <bool is_class> |
| 72 | struct is_polymorphic_selector |
| 73 | { |
| 74 | template <class T> |
| 75 | struct rebind |
| 76 | { |
| 77 | typedef is_polymorphic_imp2<T> type; |
| 78 | }; |
| 79 | }; |
| 80 | |
| 81 | template <> |
| 82 | struct is_polymorphic_selector<true> |
| 83 | { |
| 84 | template <class T> |
| 85 | struct rebind |
| 86 | { |
| 87 | typedef is_polymorphic_imp1<T> type; |
| 88 | }; |
| 89 | }; |
| 90 | |
| 91 | template <class T> |
| 92 | struct is_polymorphic_imp |
| 93 | { |
| 94 | typedef is_polymorphic_selector< ::ndnboost::is_class<T>::value> selector; |
| 95 | typedef typename selector::template rebind<T> binder; |
| 96 | typedef typename binder::type imp_type; |
| 97 | BOOST_STATIC_CONSTANT(bool, value = imp_type::value); |
| 98 | }; |
| 99 | |
| 100 | } // namespace detail |
| 101 | |
| 102 | BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_polymorphic,T,::ndnboost::detail::is_polymorphic_imp<T>::value) |
| 103 | |
| 104 | #else // BOOST_IS_POLYMORPHIC |
| 105 | |
| 106 | BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_polymorphic,T,BOOST_IS_POLYMORPHIC(T)) |
| 107 | |
| 108 | #endif |
| 109 | |
| 110 | } // namespace ndnboost |
| 111 | |
Jeff Thompson | 2277ce5 | 2013-08-01 17:34:11 -0700 | [diff] [blame] | 112 | #include <ndnboost/type_traits/detail/bool_trait_undef.hpp> |
Jeff Thompson | f7d4994 | 2013-08-01 16:47:40 -0700 | [diff] [blame] | 113 | |
| 114 | #endif |