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//-----------------------------------------------------------------------------
// boost detail/reference_content.hpp header file
// See http://www.boost.org for updates, documentation, and revision history.
//-----------------------------------------------------------------------------
//
// Copyright (c) 2003
// Eric Friedman
//
// Distributed under 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)
#ifndef BOOST_DETAIL_REFERENCE_CONTENT_HPP
#define BOOST_DETAIL_REFERENCE_CONTENT_HPP
#include "boost/config.hpp"
#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
# include "boost/mpl/bool.hpp"
# include "boost/type_traits/has_nothrow_copy.hpp"
#else
# include "boost/mpl/if.hpp"
# include "boost/type_traits/is_reference.hpp"
#endif
#include "boost/mpl/void.hpp"
namespace boost {
namespace detail {
///////////////////////////////////////////////////////////////////////////////
// (detail) class template reference_content
//
// Non-Assignable wrapper for references.
//
template <typename RefT>
class reference_content
{
private: // representation
RefT content_;
public: // structors
~reference_content()
{
}
reference_content(RefT r)
: content_( r )
{
}
reference_content(const reference_content& operand)
: content_( operand.content_ )
{
}
private: // non-Assignable
reference_content& operator=(const reference_content&);
public: // queries
RefT get() const
{
return content_;
}
};
///////////////////////////////////////////////////////////////////////////////
// (detail) metafunction make_reference_content
//
// Wraps with reference_content if specified type is reference.
//
template <typename T = mpl::void_> struct make_reference_content;
#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
template <typename T>
struct make_reference_content
{
typedef T type;
};
template <typename T>
struct make_reference_content< T& >
{
typedef reference_content<T&> type;
};
#else // defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
template <typename T>
struct make_reference_content
: mpl::if_<
is_reference<T>
, reference_content<T>
, T
>
{
};
#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION workaround
template <>
struct make_reference_content< mpl::void_ >
{
template <typename T>
struct apply
: make_reference_content<T>
{
};
typedef mpl::void_ type;
};
} // namespace detail
///////////////////////////////////////////////////////////////////////////////
// reference_content<T&> type traits specializations
//
#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
template <typename T>
struct has_nothrow_copy<
::boost::detail::reference_content< T& >
>
: mpl::true_
{
};
#endif // !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
} // namespace boost
#endif // BOOST_DETAIL_REFERENCE_CONTENT_HPP
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