skerror.cpp
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	#include "skerror.h"
	#include <ostream>
	#include <iomanip>

	using namespace std;
	using namespace symkit;

	SKError::SKError(const SKErrorType& type,
	const std::string &functionName,
	const std::string &className,
	const std::string &comment,
	bool fatal)

	: type(type), functionName(functionName), className(className), comment(comment), fatal(fatal)
	{

	}

	ostream& operator<<(ostream& os, const SKError &err)
	{
	os << "Error ";

	switch (err.type)
	{
	case ERR_INIT:
	os << "initializing symkit ";
	break;

	case ERR_EVOLVE:
	os << "during scene evolution ";
	break;

	case ERR_RENDER:
	os << "in rendering process ";
	break;

	case ERR_NULL_POINTER:
	os << "caused by a NULL pointer dereferencing ";
	break;

	case ERR_NUMERICAL:
	os << "caused by a wrong numerical operation ";
	break;

	case ERR_OTHERS:
	os << "of unknown entity ";
	break;

	default:
	os << "of unknown entity ";
	break;
	}

	if (err.className != "")
	os << "in class " << err.className << ", ";

	os << ", " << "in function " << err.functionName << ": " << endl << endl;

	os << setw(4) << err.comment << setw(1) << endl;

	return os;
	}