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