epoc32/include/stdapis/boost/variant/detail/apply_visitor_unary.hpp
author William Roberts <williamr@symbian.org>
Wed, 31 Mar 2010 12:27:01 +0100
branchSymbian2
changeset 3 e1b950c65cb4
permissions -rw-r--r--
Attempt to represent the S^2->S^3 header reorganisation as a series of "hg rename" operations
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//-----------------------------------------------------------------------------
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// boost variant/detail/apply_visitor_unary.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) 2002-2003
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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_VARIANT_DETAIL_APPLY_VISITOR_UNARY_HPP
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#define BOOST_VARIANT_DETAIL_APPLY_VISITOR_UNARY_HPP
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#include "boost/config.hpp"
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#include "boost/detail/workaround.hpp"
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#include "boost/variant/detail/generic_result_type.hpp"
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#include "boost/utility/enable_if.hpp"
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namespace boost {
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//////////////////////////////////////////////////////////////////////////
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// function template apply_visitor(visitor, visitable)
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//
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// Visits visitable with visitor.
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//
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//
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// nonconst-visitor version:
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//
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#if !BOOST_WORKAROUND(__EDG__, BOOST_TESTED_AT(302))
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#   define BOOST_VARIANT_AUX_APPLY_VISITOR_NON_CONST_RESULT_TYPE(V) \
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    BOOST_VARIANT_AUX_GENERIC_RESULT_TYPE(typename V::result_type) \
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    /**/
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#else // EDG-based compilers
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#   define BOOST_VARIANT_AUX_APPLY_VISITOR_NON_CONST_RESULT_TYPE(V) \
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    typename enable_if< \
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          mpl::not_< is_const< V > > \
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        , BOOST_VARIANT_AUX_GENERIC_RESULT_TYPE(typename V::result_type) \
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        >::type \
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    /**/
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#endif // EDG-based compilers workaround
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template <typename Visitor, typename Visitable>
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inline
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    BOOST_VARIANT_AUX_APPLY_VISITOR_NON_CONST_RESULT_TYPE(Visitor)
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apply_visitor(Visitor& visitor, Visitable& visitable)
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{
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    return visitable.apply_visitor(visitor);
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}
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#undef BOOST_VARIANT_AUX_APPLY_VISITOR_NON_CONST_RESULT_TYPE
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//
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// const-visitor version:
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//
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#if !BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
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template <typename Visitor, typename Visitable>
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inline
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    BOOST_VARIANT_AUX_GENERIC_RESULT_TYPE(typename Visitor::result_type)
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apply_visitor(const Visitor& visitor, Visitable& visitable)
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{
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    return visitable.apply_visitor(visitor);
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}
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#endif // MSVC7 and below exclusion
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} // namespace boost
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#endif // BOOST_VARIANT_DETAIL_APPLY_VISITOR_UNARY_HPP