author | jjkang |
Wed, 23 Jun 2010 16:56:47 +0800 | |
changeset 590 | 360bd6b35136 |
parent 0 | 044383f39525 |
permissions | -rw-r--r-- |
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//----------------------------------------------------------------------------- |
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// boost detail/reference_content.hpp header file |
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// See http://www.boost.org for updates, documentation, and revision history. |
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//----------------------------------------------------------------------------- |
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// |
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// Copyright (c) 2003 |
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// Eric Friedman |
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// |
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// Distributed under the Boost Software License, Version 1.0. (See |
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// accompanying file LICENSE_1_0.txt or copy at |
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// http://www.boost.org/LICENSE_1_0.txt) |
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#ifndef BOOST_DETAIL_REFERENCE_CONTENT_HPP |
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#define BOOST_DETAIL_REFERENCE_CONTENT_HPP |
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#include "boost/config.hpp" |
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#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) |
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# include "boost/mpl/bool.hpp" |
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# include "boost/type_traits/has_nothrow_copy.hpp" |
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#else |
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# include "boost/mpl/if.hpp" |
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# include "boost/type_traits/is_reference.hpp" |
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#endif |
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#include "boost/mpl/void.hpp" |
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namespace boost { |
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namespace detail { |
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/////////////////////////////////////////////////////////////////////////////// |
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// (detail) class template reference_content |
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// |
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// Non-Assignable wrapper for references. |
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// |
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template <typename RefT> |
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class reference_content |
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{ |
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private: // representation |
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RefT content_; |
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public: // structors |
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~reference_content() |
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{ |
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} |
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reference_content(RefT r) |
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: content_( r ) |
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{ |
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} |
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reference_content(const reference_content& operand) |
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: content_( operand.content_ ) |
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{ |
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} |
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private: // non-Assignable |
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reference_content& operator=(const reference_content&); |
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public: // queries |
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RefT get() const |
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{ |
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return content_; |
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} |
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}; |
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/////////////////////////////////////////////////////////////////////////////// |
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// (detail) metafunction make_reference_content |
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// |
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// Wraps with reference_content if specified type is reference. |
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// |
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template <typename T = mpl::void_> struct make_reference_content; |
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#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) |
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template <typename T> |
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struct make_reference_content |
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{ |
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typedef T type; |
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}; |
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template <typename T> |
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struct make_reference_content< T& > |
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{ |
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typedef reference_content<T&> type; |
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}; |
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#else // defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) |
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template <typename T> |
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struct make_reference_content |
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: mpl::if_< |
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is_reference<T> |
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, reference_content<T> |
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, T |
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> |
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{ |
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}; |
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#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION workaround |
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template <> |
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struct make_reference_content< mpl::void_ > |
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{ |
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template <typename T> |
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struct apply |
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: make_reference_content<T> |
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{ |
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}; |
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typedef mpl::void_ type; |
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}; |
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} // namespace detail |
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/////////////////////////////////////////////////////////////////////////////// |
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// reference_content<T&> type traits specializations |
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// |
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#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) |
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template <typename T> |
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struct has_nothrow_copy< |
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::boost::detail::reference_content< T& > |
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> |
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: mpl::true_ |
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{ |
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}; |
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#endif // !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) |
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} // namespace boost |
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#endif // BOOST_DETAIL_REFERENCE_CONTENT_HPP |