[857] | 1 | #ifndef BOOST_TT_IS_ABSTRACT_CLASS_HPP
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| 2 | #define BOOST_TT_IS_ABSTRACT_CLASS_HPP
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| 3 |
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| 4 | #if defined(_MSC_VER) && (_MSC_VER >= 1020)
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| 5 | # pragma once
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| 6 | #endif
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| 7 |
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| 8 | /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
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| 9 | // is_abstract_class.hpp:
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| 10 | //
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| 11 | // (C) Copyright 2002 Rani Sharoni (rani_sharoni@hotmail.com) and Robert Ramey
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| 12 | // Use, modification and distribution is subject to the Boost Software
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| 13 | // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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| 14 | // http://www.boost.org/LICENSE_1_0.txt)
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| 15 | //
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| 16 | // See http://www.boost.org for updates, documentation, and revision history.
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| 17 | //
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| 18 |
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| 19 | // Compile type discovery whether given type is abstract class or not.
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| 20 | //
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| 21 | // Requires DR 337 to be supported by compiler
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| 22 | // (http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/cwg_active.html#337).
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| 23 | //
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| 24 | //
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| 25 | // Believed (Jan 2004) to work on:
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| 26 | // - GCC 3.4
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| 27 | // - VC++ 7.1
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| 28 | // - compilers with new EDG frontend (Intel C++ 7, Comeau 4.3.2)
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| 29 | //
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| 30 | // Doesn't work on:
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| 31 | // - VC++6, VC++7.0 and less
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| 32 | // - GCC 3.3.X and less
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| 33 | // - Borland C++ 6 and less
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| 34 | //
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| 35 | //
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| 36 | // History:
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| 37 | // - Originally written by Rani Sharoni, see
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| 38 | // http://groups.google.com/groups?selm=df893da6.0207110613.75b2fe90%40posting.google.com
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| 39 | // At this time supported by EDG (Intel C++ 7, Comeau 4.3.2) and VC7.1.
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| 40 | // - Adapted and added into Boost.Serialization library by Robert Ramey
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| 41 | // (starting with submission #10).
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| 42 | // - Jan 2004: GCC 3.4 fixed to suport DR337 (Giovanni Bajo).
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| 43 | // - Jan 2004: modified to be part of Boost.TypeTraits (Pavel Vozenilek).
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| 44 | // - Nov 2004: Christoph Ludwig found that the implementation did not work with
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| 45 | // template types and gcc-3.4 or VC7.1, fix due to Christoph Ludwig
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| 46 | // and John Maddock.
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| 47 | // - Dec 2004: Added new config macro BOOST_NO_IS_ABSTRACT which causes the template
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| 48 | // to degrade gracefully, rather than trash the compiler (John Maddock).
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| 49 | //
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| 50 |
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| 51 | #include <boost/static_assert.hpp>
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| 52 | #include <boost/type_traits/detail/yes_no_type.hpp>
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| 53 | #include <boost/type_traits/is_class.hpp>
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| 54 | #include "boost/type_traits/detail/ice_and.hpp"
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| 55 | #ifdef BOOST_NO_IS_ABSTRACT
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| 56 | #include <boost/type_traits/is_polymorphic.hpp>
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| 57 | #endif
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| 58 | // should be the last #include
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| 59 | #include "boost/type_traits/detail/bool_trait_def.hpp"
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| 60 |
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| 61 |
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| 62 | namespace boost {
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| 63 | namespace detail{
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| 64 |
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| 65 | #ifndef BOOST_NO_IS_ABSTRACT
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| 66 | template<class T>
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| 67 | struct is_abstract_imp2
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| 68 | {
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| 69 | // Deduction fails if T is void, function type,
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| 70 | // reference type (14.8.2/2)or an abstract class type
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| 71 | // according to review status issue #337
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| 72 | //
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| 73 | template<class U>
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| 74 | static type_traits::no_type check_sig(U (*)[1]);
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| 75 | template<class U>
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| 76 | static type_traits::yes_type check_sig(...);
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| 77 | //
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| 78 | // T must be a complete type, further if T is a template then
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| 79 | // it must be instantiated in order for us to get the right answer:
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| 80 | //
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| 81 | BOOST_STATIC_ASSERT(sizeof(T) != 0);
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| 82 |
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| 83 | // GCC2 won't even parse this template if we embed the computation
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| 84 | // of s1 in the computation of value.
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| 85 | #ifdef __GNUC__
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| 86 | BOOST_STATIC_CONSTANT(unsigned, s1 = sizeof(is_abstract_imp2<T>::template check_sig<T>(0)));
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| 87 | #else
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| 88 | BOOST_STATIC_CONSTANT(unsigned, s1 = sizeof(check_sig<T>(0)));
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| 89 | #endif
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| 90 |
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| 91 | BOOST_STATIC_CONSTANT(bool, value =
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| 92 | (s1 == sizeof(type_traits::yes_type)));
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| 93 | };
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| 94 |
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| 95 | template <bool v>
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| 96 | struct is_abstract_select
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| 97 | {
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| 98 | template <class T>
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| 99 | struct rebind
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| 100 | {
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| 101 | typedef is_abstract_imp2<T> type;
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| 102 | };
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| 103 | };
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| 104 | template <>
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| 105 | struct is_abstract_select<false>
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| 106 | {
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| 107 | template <class T>
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| 108 | struct rebind
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| 109 | {
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| 110 | typedef false_type type;
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| 111 | };
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| 112 | };
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| 113 |
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| 114 | template <class T>
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| 115 | struct is_abstract_imp
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| 116 | {
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| 117 | typedef is_abstract_select< ::boost::is_class<T>::value> selector;
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| 118 | typedef typename selector::template rebind<T> binder;
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| 119 | typedef typename binder::type type;
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| 120 |
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| 121 | BOOST_STATIC_CONSTANT(bool, value = type::value);
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| 122 | };
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| 123 |
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| 124 | #endif
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| 125 | }
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| 126 |
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| 127 | #ifndef BOOST_NO_IS_ABSTRACT
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| 128 | BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_abstract,T,::boost::detail::is_abstract_imp<T>::value)
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| 129 | #else
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| 130 | BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_abstract,T,::boost::detail::is_polymorphic_imp<T>::value)
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| 131 | #endif
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| 132 |
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| 133 | } // namespace boost
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| 134 |
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| 135 | #include "boost/type_traits/detail/bool_trait_undef.hpp"
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| 136 |
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| 137 | #endif //BOOST_TT_IS_ABSTRACT_CLASS_HPP
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