c++解决枚举类型不能重名的宏

最新推荐文章于 2024-11-23 00:48:18 发布

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最新推荐文章于 2024-11-23 00:48:18 发布

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本文链接：https://blog.youkuaiyun.com/zddblog/article/details/7539474

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本文介绍了一种在C++中通过宏来解决枚举类型中元素重名问题的方法，提供了具体的使用示例，帮助开发者规避命名冲突。

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#define ENUM_DECLARE(class_type, enum_type) \
	public: \
	enum_type value; \
	operator enum_type(){return value;} \
	class_type(){} \
	class_type(int val){ value = (enum_type)val;} \
	class_type(const enum_type& n):value(n){}

用法示例：

#include <iostream>
using namespace std;

     
#define ENUM_DECLARE(class_type, enum_type) \
	public: \
	enum_type value; \
	operator enum_type(){return value;} \
	class_type(){} \
	class_type(int val){ value = (enum_type)val;} \
	class_type(const enum_type& n):value(n){}



struct Day
{
	enum _Day
	{
		One = 1,
		Two,
		Three
	};
	ENUM_DECLARE(Day, _Day)
};

struct Night
{
	enum _Night
	{
		One = 1,
		Two,
		Three,
		Four
	};

	ENUM_DECLARE(Night, _Night)
};


void test(Night n)
{
	cout << n << "in test"<<endl;
}

void test_day(Day d)
{
	cout << d << "in test"<<endl;
}

int main()
{
	Night night;
	night = Night::One;

	cout <<night<<endl;

	if(night == 1)
		cout <<"assert(night ==1)"<<endl;
	else
		cout <<night<<endl;

	int a = (int)night;
	cout <<"a = " <<a<<endl;

	enum aa{b, cc};
	aa bb;
	bb=(aa)3;

	night = (int)4;
	night = 4; //超出的权限
	//bb = 4; //error

	if(night == Night::Four)
		cout <<"Four"<<endl;
	else
		cout <<night<< "== "<<endl;

	test(night);
	test(Night::One);
	test(Night::Two);

	cout <<"xxx"<<endl;
	Day day;
	day = Day::One;
	cout <<day<<endl;

	test_day(Day::Three);
	test_day(day);



	char c; 
	cin>>c;

	return 0;
}