[857] | 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) && (__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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