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182 lines
4.5 KiB
182 lines
4.5 KiB
//----------------------------------------------------------------------------- |
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// boost variant/detail/apply_visitor_binary.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_BINARY_HPP |
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#define BOOST_VARIANT_DETAIL_APPLY_VISITOR_BINARY_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/variant/detail/apply_visitor_unary.hpp" |
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#if BOOST_WORKAROUND(__EDG__, BOOST_TESTED_AT(302)) |
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#include "boost/utility/enable_if.hpp" |
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#include "boost/mpl/not.hpp" |
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#include "boost/type_traits/is_const.hpp" |
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#endif |
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namespace boost { |
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////////////////////////////////////////////////////////////////////////// |
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// function template apply_visitor(visitor, visitable1, visitable2) |
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// |
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// Visits visitable1 and visitable2 such that their values (which we |
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// shall call x and y, respectively) are used as arguments in the |
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// expression visitor(x, y). |
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// |
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namespace detail { namespace variant { |
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template <typename Visitor, typename Value1> |
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class apply_visitor_binary_invoke |
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{ |
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public: // visitor typedefs |
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typedef typename Visitor::result_type |
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result_type; |
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private: // representation |
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Visitor& visitor_; |
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Value1& value1_; |
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public: // structors |
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apply_visitor_binary_invoke(Visitor& visitor, Value1& value1) |
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: visitor_(visitor) |
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, value1_(value1) |
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{ |
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} |
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public: // visitor interfaces |
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template <typename Value2> |
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BOOST_VARIANT_AUX_GENERIC_RESULT_TYPE(result_type) |
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operator()(Value2& value2) |
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{ |
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return visitor_(value1_, value2); |
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} |
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private: |
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apply_visitor_binary_invoke& operator=(const apply_visitor_binary_invoke&); |
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}; |
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template <typename Visitor, typename Visitable2> |
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class apply_visitor_binary_unwrap |
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{ |
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public: // visitor typedefs |
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typedef typename Visitor::result_type |
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result_type; |
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private: // representation |
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Visitor& visitor_; |
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Visitable2& visitable2_; |
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public: // structors |
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apply_visitor_binary_unwrap(Visitor& visitor, Visitable2& visitable2) |
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: visitor_(visitor) |
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, visitable2_(visitable2) |
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{ |
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} |
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public: // visitor interfaces |
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template <typename Value1> |
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BOOST_VARIANT_AUX_GENERIC_RESULT_TYPE(result_type) |
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operator()(Value1& value1) |
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{ |
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apply_visitor_binary_invoke< |
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Visitor |
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, Value1 |
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> invoker(visitor_, value1); |
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return boost::apply_visitor(invoker, visitable2_); |
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} |
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private: |
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apply_visitor_binary_unwrap& operator=(const apply_visitor_binary_unwrap&); |
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}; |
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}} // namespace detail::variant |
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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 Visitable1, typename Visitable2> |
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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( |
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Visitor& visitor |
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, Visitable1& visitable1, Visitable2& visitable2 |
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) |
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{ |
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::boost::detail::variant::apply_visitor_binary_unwrap< |
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Visitor, Visitable2 |
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> unwrapper(visitor, visitable2); |
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return boost::apply_visitor(unwrapper, visitable1); |
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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 Visitable1, typename Visitable2> |
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inline |
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BOOST_VARIANT_AUX_GENERIC_RESULT_TYPE( |
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typename Visitor::result_type |
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) |
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apply_visitor( |
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const Visitor& visitor |
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, Visitable1& visitable1, Visitable2& visitable2 |
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) |
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{ |
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::boost::detail::variant::apply_visitor_binary_unwrap< |
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const Visitor, Visitable2 |
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> unwrapper(visitor, visitable2); |
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return boost::apply_visitor(unwrapper, visitable1); |
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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_BINARY_HPP
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