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#ifndef QPID_EXCEPTIONHOLDER_H
#define QPID_EXCEPTIONHOLDER_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 <boost/shared_ptr.hpp>
namespace qpid {
namespace sys {
struct Raisable {
virtual ~Raisable() {};
virtual void raise() const=0;
virtual std::string what() const=0;
};
/**
* Holder for exceptions. Allows the thread that notices an error condition to
* create an exception and store it to be thrown by another thread.
*/
class ExceptionHolder : public Raisable {
public:
ExceptionHolder() {}
// Use default copy & assign.
/** Take ownership of ex */
template <class Ex> ExceptionHolder(Ex* ex) { wrap(ex); }
template <class Ex> ExceptionHolder& operator=(Ex* ex) { wrap(ex); return *this; }
void raise() const { if (wrapper.get()) wrapper->raise() ; }
std::string what() const { return wrapper.get() ? wrapper->what() : std::string(); }
bool empty() const { return !wrapper.get(); }
operator bool() const { return !empty(); }
void reset() { wrapper.reset(); }
private:
template <class Ex> struct Wrapper : public Raisable {
Wrapper(Ex* ptr) : exception(ptr) {}
void raise() const { throw *exception; }
std::string what() const { return exception->what(); }
boost::shared_ptr<Ex> exception;
};
template <class Ex> void wrap(Ex* ex) { wrapper.reset(new Wrapper<Ex>(ex)); }
boost::shared_ptr<Raisable> wrapper;
};
}} // namespace qpid::sys
#endif /*!QPID_EXCEPTIONHOLDER_H*/
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