98 lines
2.6 KiB
C++
98 lines
2.6 KiB
C++
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// (C) Copyright Dave Abrahams, Steve Cleary, Beman Dawes, Howard
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// Hinnant & John Maddock 2000.
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// Use, modification and distribution are subject to the Boost Software License,
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt).
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//
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// See http://www.boost.org/libs/type_traits for most recent version including documentation.
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#ifndef BOOST_TT_DETAIL_CV_TRAITS_IMPL_HPP_INCLUDED
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#define BOOST_TT_DETAIL_CV_TRAITS_IMPL_HPP_INCLUDED
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#include <boost/config.hpp>
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#include <boost/detail/workaround.hpp>
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#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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// implementation helper:
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#if !(BOOST_WORKAROUND(__GNUC__,== 3) && BOOST_WORKAROUND(__GNUC_MINOR__, <= 2))
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namespace boost {
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namespace detail {
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#else
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#include <boost/type_traits/detail/yes_no_type.hpp>
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namespace boost {
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namespace type_traits {
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namespace gcc8503 {
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#endif
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template <typename T> struct cv_traits_imp {};
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template <typename T>
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struct cv_traits_imp<T*>
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{
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BOOST_STATIC_CONSTANT(bool, is_const = false);
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BOOST_STATIC_CONSTANT(bool, is_volatile = false);
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typedef T unqualified_type;
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};
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template <typename T>
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struct cv_traits_imp<const T*>
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{
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BOOST_STATIC_CONSTANT(bool, is_const = true);
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BOOST_STATIC_CONSTANT(bool, is_volatile = false);
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typedef T unqualified_type;
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};
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template <typename T>
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struct cv_traits_imp<volatile T*>
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{
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BOOST_STATIC_CONSTANT(bool, is_const = false);
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BOOST_STATIC_CONSTANT(bool, is_volatile = true);
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typedef T unqualified_type;
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};
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template <typename T>
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struct cv_traits_imp<const volatile T*>
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{
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BOOST_STATIC_CONSTANT(bool, is_const = true);
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BOOST_STATIC_CONSTANT(bool, is_volatile = true);
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typedef T unqualified_type;
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};
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#if BOOST_WORKAROUND(__GNUC__,== 3) && BOOST_WORKAROUND(__GNUC_MINOR__, <= 2)
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// We have to exclude function pointers
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// (see http://gcc.gnu.org/bugzilla/show_bug.cgi?8503)
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yes_type mini_funcptr_tester(...);
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no_type mini_funcptr_tester(const volatile void*);
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} // namespace gcc8503
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} // namespace type_traits
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namespace detail {
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// Use the implementation above for non function pointers
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template <typename T, unsigned Select
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= (unsigned)sizeof(::boost::type_traits::gcc8503::mini_funcptr_tester((T)0)) >
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struct cv_traits_imp : public ::boost::type_traits::gcc8503::cv_traits_imp<T> { };
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// Functions are never cv-qualified
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template <typename T> struct cv_traits_imp<T*,1>
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{
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BOOST_STATIC_CONSTANT(bool, is_const = false);
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BOOST_STATIC_CONSTANT(bool, is_volatile = false);
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typedef T unqualified_type;
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};
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#endif
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} // namespace detail
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} // namespace boost
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#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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#endif // BOOST_TT_DETAIL_CV_TRAITS_IMPL_HPP_INCLUDED
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