1 | |
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2 | // (C) Copyright Dave Abrahams, Steve Cleary, Beman Dawes, Howard |
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3 | // Hinnant & John Maddock 2000. |
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4 | // Use, modification and distribution are subject to the Boost Software License, |
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5 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
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6 | // http://www.boost.org/LICENSE_1_0.txt). |
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7 | // |
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8 | // See http://www.boost.org/libs/type_traits for most recent version including documentation. |
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9 | |
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10 | |
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11 | #ifndef BOOST_TT_DETAIL_CV_TRAITS_IMPL_HPP_INCLUDED |
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12 | #define BOOST_TT_DETAIL_CV_TRAITS_IMPL_HPP_INCLUDED |
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13 | |
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14 | #include <boost/config.hpp> |
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15 | #include <boost/detail/workaround.hpp> |
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16 | |
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17 | #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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18 | |
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19 | // implementation helper: |
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20 | |
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21 | |
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22 | #if !(BOOST_WORKAROUND(__GNUC__,== 3) && BOOST_WORKAROUND(__GNUC_MINOR__, <= 2)) |
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23 | namespace boost { |
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24 | namespace detail { |
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25 | #else |
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26 | #include <boost/type_traits/detail/yes_no_type.hpp> |
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27 | namespace boost { |
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28 | namespace type_traits { |
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29 | namespace gcc8503 { |
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30 | #endif |
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31 | |
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32 | template <typename T> struct cv_traits_imp {}; |
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33 | |
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34 | template <typename T> |
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35 | struct cv_traits_imp<T*> |
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36 | { |
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37 | BOOST_STATIC_CONSTANT(bool, is_const = false); |
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38 | BOOST_STATIC_CONSTANT(bool, is_volatile = false); |
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39 | typedef T unqualified_type; |
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40 | }; |
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41 | |
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42 | template <typename T> |
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43 | struct cv_traits_imp<const T*> |
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44 | { |
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45 | BOOST_STATIC_CONSTANT(bool, is_const = true); |
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46 | BOOST_STATIC_CONSTANT(bool, is_volatile = false); |
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47 | typedef T unqualified_type; |
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48 | }; |
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49 | |
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50 | template <typename T> |
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51 | struct cv_traits_imp<volatile T*> |
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52 | { |
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53 | BOOST_STATIC_CONSTANT(bool, is_const = false); |
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54 | BOOST_STATIC_CONSTANT(bool, is_volatile = true); |
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55 | typedef T unqualified_type; |
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56 | }; |
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57 | |
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58 | template <typename T> |
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59 | struct cv_traits_imp<const volatile T*> |
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60 | { |
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61 | BOOST_STATIC_CONSTANT(bool, is_const = true); |
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62 | BOOST_STATIC_CONSTANT(bool, is_volatile = true); |
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63 | typedef T unqualified_type; |
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64 | }; |
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65 | |
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66 | #if BOOST_WORKAROUND(__GNUC__,== 3) && BOOST_WORKAROUND(__GNUC_MINOR__, <= 2) |
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67 | // We have to exclude function pointers |
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68 | // (see http://gcc.gnu.org/bugzilla/show_bug.cgi?8503) |
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69 | yes_type mini_funcptr_tester(...); |
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70 | no_type mini_funcptr_tester(const volatile void*); |
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71 | |
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72 | } // namespace gcc8503 |
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73 | } // namespace type_traits |
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74 | |
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75 | namespace detail { |
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76 | |
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77 | // Use the implementation above for non function pointers |
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78 | template <typename T, unsigned Select |
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79 | = (unsigned)sizeof(::boost::type_traits::gcc8503::mini_funcptr_tester((T)0)) > |
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80 | struct cv_traits_imp : ::boost::type_traits::gcc8503::cv_traits_imp<T> { }; |
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81 | |
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82 | // Functions are never cv-qualified |
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83 | template <typename T> struct cv_traits_imp<T*,1> |
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84 | { |
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85 | BOOST_STATIC_CONSTANT(bool, is_const = false); |
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86 | BOOST_STATIC_CONSTANT(bool, is_volatile = false); |
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87 | typedef T unqualified_type; |
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88 | }; |
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89 | |
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90 | #endif |
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91 | |
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92 | } // namespace detail |
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93 | } // namespace boost |
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94 | |
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95 | #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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96 | |
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97 | #endif // BOOST_TT_DETAIL_CV_TRAITS_IMPL_HPP_INCLUDED |
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