c++ std exception example

	// code from Dr.Dobbs (http://www.drdobbs.com/)
	// StreamingException.h
	//
	#ifndef STREAMING_EXCEPTION
	#define STREAMING_EXCEPTION
	#include <iostream>
	#include <sstream>
	#include <memory>
	#include <stdexcept>
	class StreamingException : public std::runtime_error
	{
	public:
	StreamingException() :
	std::runtime_error(""),
	ss_(std::auto_ptr<std::stringstream>
	(new std::stringstream()))
	{
	}
	~StreamingException() throw()
	{
	}
	template <typename T>
	StreamingException & operator << (const T & t)
	{
	(*ss_) << t;
	return *this;
	}
	virtual const char * what() const throw()
	{
	s_ = ss_->str();
	return s_.c_str();
	}
	private:
	mutable std::auto_ptr<std::stringstream> ss_;
	mutable std::string s_;
	};
	#endif

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	// testException.cpp
	#include "StreamingException.h"
	int main (int argc, char * const argv[])
	{
	try
	{
	if (5 != 3)
	throw StreamingException() << 5 << " is not equal to " << 3;
	}
	catch (const StreamingException & e)
	{
	cout << e.what() << endl;
	}
	return 0;
	}

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