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Diffstat (limited to 'qpid/cpp/src/qpid/amqp_0_10/Holder.h')
-rw-r--r-- | qpid/cpp/src/qpid/amqp_0_10/Holder.h | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/qpid/cpp/src/qpid/amqp_0_10/Holder.h b/qpid/cpp/src/qpid/amqp_0_10/Holder.h new file mode 100644 index 0000000000..605d2e0ed5 --- /dev/null +++ b/qpid/cpp/src/qpid/amqp_0_10/Holder.h @@ -0,0 +1,103 @@ +#ifndef QPID_AMQP_0_10_HOLDER_H +#define QPID_AMQP_0_10_HOLDER_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. + * + */ +#include "qpid/framing/Blob.h" +#include "qpid/amqp_0_10/apply.h" + +namespace qpid { +namespace amqp_0_10 { + +using framing::in_place; + +template <class Invokable> struct InvokeVisitor { + typedef void result_type; + Invokable& target; + InvokeVisitor(Invokable& i) : target(i) {} + + template <class Action> + void operator()(const Action& action) { action.invoke(target); } +}; + +template <class DerivedHolder, class BaseHeld, size_t Size> +class Holder : public framing::Blob<Size, BaseHeld> { + typedef framing::Blob<Size, BaseHeld> Base; + + public: + + Holder() {} + template <class T> explicit Holder(const T& value) : Base(value) {} + + using Base::operator=; + Holder& operator=(const BaseHeld& rhs); + + uint8_t getCode() const { return this->get()->getCode(); } + uint8_t getClassCode() const { return this->get()->getClassCode(); } + + template <class Invokable> void invoke(Invokable& i) const { + InvokeVisitor<Invokable> v(i); + apply(v, *this->get()); + } + + template <class S> void encode(S& s) const { + s(getClassCode())(getCode()); + } + + template <class S> void decode(S& s) { + uint8_t code, classCode; + s(classCode)(code); + static_cast<DerivedHolder*>(this)->set(classCode, code); + } + + template <class S> void serialize(S& s) { + s.split(*this); + qpid::amqp_0_10::apply(s, *this->get()); + } + + template <class T> T* getIf() { + return (getClassCode()==T::CLASS_CODE && getCode()==T::CODE) ? static_cast<T*>(this->get()) : 0; + } + + template <class T> const T* getIf() const { + return (getClassCode()==T::CLASS_CODE && getCode()==T::CODE) ? static_cast<T*>(this->get()) : 0; + } + + private: + struct Assign : public ApplyFunctor<void> { + Holder& holder; + Assign(Holder& x) : holder(x) {} + template <class T> void operator()(const T& rhs) { holder=rhs; } + }; +}; + +template <class D, class B, size_t S> +Holder<D,B,S>& Holder<D,B,S>::operator=(const B& rhs) { + Assign assign(*this); + qpid::amqp_0_10::apply(assign, rhs); + return *this; +} + + + +}} // namespace qpid::amqp_0_10 + +#endif /*!QPID_AMQP_0_10_HOLDER_H*/ |