简单工厂

#include <iostream>

using namespace std;

class Operation
{
public:
	Operation() {}
	Operation(const double& dNumberOne, const double& dNumberTwo) : m_dNumberOne(dNumberOne), m_dNumberTwo(dNumberTwo) {}
	const double getNumberOne() { return m_dNumberOne; }
	void setNumberOne(const double& dNumberOne) { m_dNumberOne = dNumberOne; }
	const double getNumberTwo() { return m_dNumberTwo; }
	void setNumberTwo(const double& dNumberTwo) { m_dNumberTwo = dNumberTwo; }
	virtual double getResult() { return 0; }
	static Operation* createOperation(string strOperation, const double& dNumberOne = 0, const double& dNumberTwo = 0);
private:
	double m_dNumberOne = 0;
	double m_dNumberTwo = 0;
};

class OperationAdd : public Operation
{
public:
	OperationAdd() {}
	OperationAdd(const double& dNumberOne, const double& dNumberTwo) : Operation(dNumberOne, dNumberTwo) {}
	virtual double getResult() override
	{
		return (Operation::getNumberOne() + Operation::getNumberTwo());
	}
};

Operation* Operation::createOperation(string strOperation, const double& dNumberOne, const double& dNumberTwo)
{
	Operation* objOperation = nullptr;
	if (strOperation == "+")
	{
		objOperation = new OperationAdd(dNumberOne, dNumberTwo);
	}
	return objOperation;
}

int main()
{
	Operation* objOperation;
	string strOperation = "+";
	double dNumberOne = 1;
	double dNumberTwo = 2;
	objOperation = Operation::createOperation(strOperation, dNumberOne, dNumberTwo);
	cout << objOperation->getResult() << endl;
	return 0;
}

总结:静态的createOperation函数创建需要的子类,多态调用正确的getResult函数得到结果

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