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37 lines
1.2 KiB
C++
37 lines
1.2 KiB
C++
/*
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* Copyright (C) 2017 ScyllaDB
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*/
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/*
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* This file is part of Scylla.
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*
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* Scylla is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Scylla is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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template <typename ResultType, typename Visitor>
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struct boost_visitor_adapter : Visitor {
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using result_type = ResultType;
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boost_visitor_adapter(Visitor&& v) : Visitor(std::move(v)) {}
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};
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// Boost 1.55 requires that visitors expose a `result_type` member. This
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// function adds it.
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template <typename ResultType = void, typename Visitor>
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auto
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to_boost_visitor(Visitor&& v) {
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return boost_visitor_adapter<ResultType, Visitor>(std::move(v));
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}
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