double Disvision(int a, int b)
{
    if (b == 0)
    {
        throw  "Disvision by zero condition";
    }
    else
    {
        return ((double)a / (double)b);
    }
}
void Func()
{
    int len, time;
    cin >> len >> time;
    cout << Disvision(len, time) << endl;
}
int main()
{
    try 
    {
        Func();
    }
    catch(const char* errmsg)
    {
        cout << errmsg << endl;
    }
    catch (...)
    {
        cout << "unkown exception" << endl;
    }
    return 0;
}

double Disvision(int a, int b)
{
    if (b == 0)
    {
        throw  "Disvision by zero condition";
    }
    else
    {
        return ((double)a / (double)b);
    }
}
void Func()
{
    int* array = new int[10];
    int len, time;
    cin >> len >> time;
    cout << Disvision(len, time) << endl;
    delete[] array;//一旦拋出異常，這里就不會(huì)被執(zhí)行
}
int main()
{
    try 
    {
        Func();
    }
    catch(const char* errmsg)
    {
        cout << errmsg << endl;
    }
    catch (...)
    {
        cout << "unkown exception" << endl;
    }
    return 0;
}

void Func()
{
    int* array = new int[10];
    int len, time;
    cin >> len >> time;
    try {
        cout << Disvision(len, time) << endl;
    }
    catch (const char* errmsg)
    {
        cout << "釋放空間" << endl;
        delete[] array;
        throw;
    }
}

class Exception
{
public:
	Exception(const string& errmsg, int id)
		:_errmsg(errmsg)
		, _id(id)
	{}

	virtual string what() const
	{
		return _errmsg;
	}
protected:
	string _errmsg;
	int _id;
};

class SqlException : public Exception
{
public:
	SqlException(const string& errmsg, int id, const string& sql)
		:Exception(errmsg, id)
		, _sql(sql)
	{}

	virtual string what() const
	{
		string str = "SqlException:";
		str += _errmsg;
		str += "->";
		str += _sql;
		return str;
	}

private:
	const string _sql;
};

class CacheException : public Exception
{
public:
	CacheException(const string& errmsg, int id)
		:Exception(errmsg, id)
	{}

	virtual string what() const
	{
		string str = "CacheException:";
		str += _errmsg;
		return str;
	}
};

class HttpServerException : public Exception
{
public:
	HttpServerException(const string& errmsg, int id, const string& type)
		:Exception(errmsg, id)
		, _type(type)
	{}

	virtual string what() const
	{
		string str = "HttpServerException:";
		str += _type;
		str += ":";
		str += _errmsg;
		return str;
	}

private:
	const string _type;
};

void SQLMgr()
{
	srand(time(0));
	if (rand() % 7 == 0)
	{
		throw SqlException("權(quán)限不足", 100, "select * from name = '張三'");
	}

	//throw "xxxxxx";
}

void CacheMgr()
{
	srand(time(0));
	if (rand() % 5 == 0)
	{
		throw CacheException("權(quán)限不足", 100);
	}
	else if (rand() % 6 == 0)
	{
		throw CacheException("數(shù)據(jù)不存在", 101);
	}

	SQLMgr();
}

void HttpServer()
{
	// ...
	srand(time(0));
	if (rand() % 3 == 0)
	{
		throw HttpServerException("請(qǐng)求資源不存在", 100, "get");
	}
	else if (rand() % 4 == 0)
	{
		throw HttpServerException("權(quán)限不足", 101, "post");
	}
	CacheMgr();
}

void ServerStart()
{
	while (1)
	{
		this_thread::sleep_for(chrono::seconds(1));//休眠1s
		try {
			HttpServer();
		}
		catch (const Exception& e) // 這里捕獲父類(lèi)對(duì)象就可以
		{
			// 多態(tài)
			cout << e.what() << endl;
		}
		catch (...)
		{
			cout << "Unkown Exception" << endl;
		}
	}
}
int main()
{
	ServerStart();
	return 0;
}

void func() throw(A, B, C, D);//只會(huì)拋A/B/C/D中的某種類(lèi)型的異常
void* operator new(size_t size) throw(bad alloc);//這里表示這個(gè)函數(shù)只會(huì)拋出bad_alloc的異常
void* operator new(size_t size, void* ptr) throw();//這個(gè)函數(shù)不會(huì)拋異常

bool Compare(int x, int y) noexcept(noexcept(x > y))  //C++11
{
    return x > y;//表示如果x > y不發(fā)生異常，則Compare函數(shù)不會(huì)發(fā)生異常。
}