121 lines
2.5 KiB
C++
121 lines
2.5 KiB
C++
//-----------------------------------------------------------------------------
|
|
// 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"
|
|
|
|
# include "boost/mpl/bool.hpp"
|
|
# include "boost/type_traits/has_nothrow_copy.hpp"
|
|
|
|
#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;
|
|
|
|
|
|
template <typename T>
|
|
struct make_reference_content
|
|
{
|
|
typedef T type;
|
|
};
|
|
|
|
template <typename T>
|
|
struct make_reference_content< T& >
|
|
{
|
|
typedef reference_content<T&> type;
|
|
};
|
|
|
|
|
|
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
|
|
//
|
|
|
|
|
|
template <typename T>
|
|
struct has_nothrow_copy<
|
|
::boost::detail::reference_content< T& >
|
|
>
|
|
: mpl::true_
|
|
{
|
|
};
|
|
|
|
|
|
} // namespace boost
|
|
|
|
#endif // BOOST_DETAIL_REFERENCE_CONTENT_HPP
|