cv_traits_impl.hpp

来自「boost库提供标准的C++ API 配合dev c++使用,功能更加强大」· HPP 代码 · 共 63 行

//  (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"

#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION

namespace boost {
namespace detail {

// implementation helper:

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;
};

} // namespace detail
} // namespace boost 

#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION

#endif // BOOST_TT_DETAIL_CV_TRAITS_IMPL_HPP_INCLUDED