CODE:

#include 

using namespace std;

void main(){
	rbuf rb(5);	//0～5をリングバッファ化する。初期値は0
	rb += 10;	//カウントを10進ませる
	cout 


class rbuf{
	size_t count;
	size_t maxNum;
	long beg;

public:

	rbuf(){}
	void init(long rnum){
		beg = 0;
		maxNum = abs(rnum)+1;
		count = 0;
	}
	rbuf(long rnum){ init(rnum); }
	void init(long rbeg, long rend){
		beg = rbeg;
		maxNum = abs(rend - beg)+1;
		count = beg;
	}
	rbuf(long rbeg, long rend){ init(rbeg, rend); }

	long num(){ return count; }

	long operator=(long rnum){
		count -= beg;

		if(rnum >= 0){
			count = rnum;
			count %= maxNum;
		}
		else{
			long corrected = rnum % maxNum;
			count = maxNum + corrected;
		}

		return count += beg;
	}

	long operator+=(long rnum){
		count -= beg;

		if(rnum >= 0){
			count += rnum;
			count %= maxNum;
		}
		else{
			long corrected = -(-rnum % (long)maxNum);
			count += maxNum + corrected;
			count %= maxNum;
		}

		return count += beg;
	}

	long operator-=(long rnum){
		*this += -rnum;
		return num();
	}

	//前置きインクリメント
	long operator++(){
		*this += 1;
		return num();
	}
	//後置きインクリメント
	long operator++(int){
		long answer = num();
		*this += 1;
		return answer;
	}

	//前置きデクリメント
	long operator--(){
		*this -= 1;
		return num();
	}
	//後置きデクリメント
	long operator--(int){
		long answer = num();
		*this -= 1;
		return answer;
	}

	template 
	X operator+(X rnum){ return num() + rnum; }
	template 
	X operator-(X rnum){ return num() - rnum; }
	template 
	X operator*(X rnum){ return num() * rnum; }
	template 
	X operator/(X rnum){ return num() / rnum; }
	template 
	X operator%(X rnum){ return num() % rnum; }

	template 
	bool operator==(X rnum){
		if(num() == rnum) return true;
		return false;
	}
	template 
	bool operator!=(X rnum){
		if(num() != rnum) return true;
		return false;
	}
	template 
	bool operator
	bool operator>=(X rnum){
		if(num() >= rnum) return true;
		return false;
	}
	template 
	bool operator
	bool operator>(X rnum){
		if(num() > rnum) return true;
		return false;
	}

	operator char (){ return (char)num(); }
	operator short (){ return (short)num(); }
	operator int (){ return (int)num(); }
	operator long (){ return (long)num(); }
	operator float (){ return (float)num(); }
	operator double (){ return (double)num(); }
	operator unsigned char (){ return (unsigned char)num(); }
	operator unsigned short (){ return (unsigned short)num(); }
	operator unsigned int (){ return (unsigned int)num(); }
	operator unsigned long (){ return (unsigned long)num(); }
};