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88 lines
2.6 KiB
88 lines
2.6 KiB
//----------------------------------------------------------------------------- |
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// boost variant/detail/apply_visitor_delayed.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_DELAYED_HPP |
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#define BOOST_VARIANT_DETAIL_APPLY_VISITOR_DELAYED_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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#include "boost/variant/detail/apply_visitor_binary.hpp" |
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namespace boost { |
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////////////////////////////////////////////////////////////////////////// |
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// function template apply_visitor(visitor) |
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// |
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// Returns a function object, overloaded for unary and binary usage, that |
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// visits its arguments using visitor (or a copy of visitor) via |
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// * apply_visitor( visitor, [argument] ) |
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// under unary invocation, or |
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// * apply_visitor( visitor, [argument1], [argument2] ) |
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// under binary invocation. |
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// |
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// NOTE: Unlike other apply_visitor forms, the visitor object must be |
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// non-const; this prevents user from giving temporary, to disastrous |
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// effect (i.e., returned function object would have dead reference). |
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// |
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template <typename Visitor> |
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class apply_visitor_delayed_t |
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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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public: // structors |
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explicit apply_visitor_delayed_t(Visitor& visitor) |
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: visitor_(visitor) |
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{ |
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} |
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public: // unary visitor interface |
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template <typename Visitable> |
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BOOST_VARIANT_AUX_GENERIC_RESULT_TYPE(result_type) |
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operator()(Visitable& visitable) const |
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{ |
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return apply_visitor(visitor_, visitable); |
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} |
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public: // binary visitor interface |
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template <typename Visitable1, typename Visitable2> |
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BOOST_VARIANT_AUX_GENERIC_RESULT_TYPE(result_type) |
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operator()(Visitable1& visitable1, Visitable2& visitable2) const |
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{ |
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return apply_visitor(visitor_, visitable1, visitable2); |
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} |
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private: |
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apply_visitor_delayed_t& operator=(const apply_visitor_delayed_t&); |
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}; |
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template <typename Visitor> |
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inline apply_visitor_delayed_t<Visitor> apply_visitor(Visitor& visitor) |
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{ |
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return apply_visitor_delayed_t<Visitor>(visitor); |
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} |
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} // namespace boost |
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#endif // BOOST_VARIANT_DETAIL_APPLY_VISITOR_DELAYED_HPP
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