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2 | // (C) Copyright Dave Abrahams, Steve Cleary, Beman Dawes,
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3 | // Howard Hinnant and John Maddock 2000.
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4 | // (C) Copyright Mat Marcus, Jesse Jones and Adobe Systems Inc 2001
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5 |
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6 | // Use, modification and distribution are subject to the Boost Software License,
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7 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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8 | // http://www.boost.org/LICENSE_1_0.txt).
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9 | //
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10 | // See http://www.boost.org/libs/type_traits for most recent version including documentation.
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11 |
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12 | // Fixed is_pointer, is_reference, is_const, is_volatile, is_same,
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13 | // is_member_pointer based on the Simulated Partial Specialization work
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14 | // of Mat Marcus and Jesse Jones. See http://opensource.adobe.com or
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15 | // http://groups.yahoo.com/group/boost/message/5441
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16 | // Some workarounds in here use ideas suggested from "Generic<Programming>:
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17 | // Mappings between Types and Values"
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18 | // by Andrei Alexandrescu (see http://www.cuj.com/experts/1810/alexandr.html).
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19 |
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20 |
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21 | #ifndef BOOST_TT_IS_SAME_HPP_INCLUDED
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22 | #define BOOST_TT_IS_SAME_HPP_INCLUDED
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23 |
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24 | #include "boost/type_traits/config.hpp"
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25 | #ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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26 | #include "boost/type_traits/detail/yes_no_type.hpp"
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27 | #include "boost/type_traits/detail/ice_and.hpp"
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28 | #include "boost/type_traits/is_reference.hpp"
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29 | #endif
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30 | // should be the last #include
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31 | #include "boost/type_traits/detail/bool_trait_def.hpp"
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32 |
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33 | namespace boost {
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34 |
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35 | #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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36 |
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37 | BOOST_TT_AUX_BOOL_TRAIT_DEF2(is_same,T,U,false)
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38 | BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC2_1(typename T,is_same,T,T,true)
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39 | #if BOOST_WORKAROUND(__BORLANDC__, < 0x600)
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40 | // without this, Borland's compiler gives the wrong answer for
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41 | // references to arrays:
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42 | BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC2_1(typename T,is_same,T&,T&,true)
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43 | #endif
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44 |
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45 | #else // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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46 |
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47 | namespace detail {
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48 |
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49 | #ifdef BOOST_MSVC
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50 | // the following VC6 specific implementation is *NOT* legal
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51 | // C++, but has the advantage that it works for incomplete
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52 | // types.
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53 |
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54 | template< typename T1 >
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55 | struct is_same_part_1
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56 | {
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57 | template<typename T2> struct part_2 { enum { value = false }; };
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58 | template<> struct part_2<T1> { enum { value = true }; };
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59 | };
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60 |
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61 | template< typename T1, typename T2 >
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62 | struct is_same_impl
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63 | {
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64 | enum { value = detail::is_same_part_1<T1>::template part_2<T2>::value };
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65 | };
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66 |
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67 | #else // generic "no-partial-specialization" version
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68 |
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69 | template <typename T>
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70 | ::boost::type_traits::yes_type
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71 | BOOST_TT_DECL is_same_tester(T*, T*);
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72 |
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73 | ::boost::type_traits::no_type
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74 | BOOST_TT_DECL is_same_tester(...);
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75 |
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76 | template <typename T, typename U>
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77 | struct is_same_impl
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78 | {
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79 | static T t;
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80 | static U u;
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81 |
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82 | BOOST_STATIC_CONSTANT(bool, value =
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83 | (::boost::type_traits::ice_and<
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84 | (sizeof(type_traits::yes_type) == sizeof(detail::is_same_tester(&t,&u))),
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85 | (::boost::is_reference<T>::value == ::boost::is_reference<U>::value),
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86 | (sizeof(T) == sizeof(U))
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87 | >::value));
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88 | };
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89 |
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90 | #endif // BOOST_MSVC
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91 |
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92 | } // namespace detail
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93 |
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94 | BOOST_TT_AUX_BOOL_TRAIT_DEF2(is_same,T,U,(::boost::detail::is_same_impl<T,U>::value))
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95 |
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96 | #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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97 |
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98 | } // namespace boost
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99 |
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100 | #include "boost/type_traits/detail/bool_trait_undef.hpp"
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101 |
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102 | #endif // BOOST_TT_IS_SAME_HPP_INCLUDED
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103 |
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