| //----------------------------------------------------------------------------- |
| // 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 |