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Diffstat (limited to 'cpp/src/qpid/framing/variant.h')
-rw-r--r-- | cpp/src/qpid/framing/variant.h | 91 |
1 files changed, 0 insertions, 91 deletions
diff --git a/cpp/src/qpid/framing/variant.h b/cpp/src/qpid/framing/variant.h deleted file mode 100644 index 8e13063385..0000000000 --- a/cpp/src/qpid/framing/variant.h +++ /dev/null @@ -1,91 +0,0 @@ -#ifndef QPID_FRAMING_VARIANT_H -#define QPID_FRAMING_VARIANT_H - -/* - * Licensed to the Apache Software Foundation (ASF) under one - * or more contributor license agreements. See the NOTICE file - * distributed with this work for additional information - * regarding copyright ownership. The ASF licenses this file - * to you under the Apache License, Version 2.0 (the - * "License"); you may not use this file except in compliance - * with the License. You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, - * software distributed under the License is distributed on an - * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY - * KIND, either express or implied. See the License for the - * specific language governing permissions and limitations - * under the License. - * - */ - -/**@file Tools for using boost::variant. */ - - -#include <boost/variant.hpp> - -namespace qpid { -namespace framing { -class Buffer; - -/** boost::static_visitor that throws an exception if variant contains a blank. - * Subclasses need to have a using() declaration, which can be generated - * with QPID_USING_NOBLANK(R) - */ -template <class R=void> -struct NoBlankVisitor : public boost::static_visitor<R> { - R foundBlank() const { - assert(0); - throw Exception(QPID_MSG("Invalid variant value.")); - } - R operator()(const boost::blank&) const { return foundBlank(); } - R operator()(boost::blank&) const { return foundBlank(); } -}; - - -}} // qpid::framing - - -/** Generate a using statement, needed in visitors inheriting NoBlankVisitor - * @param R return type. - */ -#define QPID_USING_NOBLANK(R) using ::qpid::framing::NoBlankVisitor<R>::operator() - -namespace qpid { -namespace framing { - -/** Convert the variant value to type R. */ -template <class R> struct ConvertVisitor : public NoBlankVisitor<R> { - QPID_USING_NOBLANK(R); - template <class T> R operator()(T& t) const { return t; } -}; - -/** Convert the address of variant value to type R. */ -template <class R> struct AddressVisitor : public NoBlankVisitor<R> { - QPID_USING_NOBLANK(R); - template <class T> R operator()(T& t) const { return &t; } -}; - -/** Apply a visitor to the nested variant.*/ -template<class V> -struct ApplyVisitor : public NoBlankVisitor<typename V::result_type> { - QPID_USING_NOBLANK(typename V::result_type); - const V& visitor; - ApplyVisitor(const V& v) : visitor(v) {} - template <class T> typename V::result_type operator()(T& t) const { - return boost::apply_visitor(visitor, t); - } -}; - -/** Convenience function to construct and apply an ApplyVisitor */ -template <class Visitor, class Visitable> -typename Visitor::result_type applyApplyVisitor(const Visitor& visitor, Visitable& visitable) { - return boost::apply_visitor(ApplyVisitor<Visitor>(visitor), visitable); -} - -}} // namespace qpid::framing - - -#endif /*!QPID_FRAMING_VARIANT_H*/ |