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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