CppUtilClasses/Rotarray.h at master · albertwcheng/CppUtilClasses · GitHub

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#ifndef _ROTARRAY_H
#define _ROTARRAY_H

#include <iostream>


template<typename T>
class Rotarray
{
	private:
		T*data;
		int startIndex;
		int size;
	public:
		int getSize()const{
			return size;
		}

		Rotarray(int _size):size(_size),startIndex(0){
			data=new T[size];
		}

		void copy(const Rotarray& right){
			if(data){
				delete[] data;
			}

			size=right.size;
			startIndex=right.startIndex;
			data=new T[size];
			for(int i=0;i<size;i++){
				(*this)[i]=right[i];
			}
		}

		Rotarray(const Rotarray& right):data(NULL){
			//copy constructor
			copy(right);
		}


		const Rotarray& operator=(const Rotarray& right){
			copy(right);
			return *this;
		}

		T& operator [](int _offset){
			return data[(_offset+startIndex)%size];
		}

		const T& operator [](int _offset)const{
			return data[(_offset+startIndex)%size];
		}

		~Rotarray(){
			if(data)
				delete[] data;
		}

		bool operator>(const Rotarray& right)const{
			int sizeCompare=min(size,right.size);

			for(int i=0;i<sizeCompare;i++){
				if((*this)[i]!=right[i]){
					return (*this)[i]>right[i];
				}
			}

			//every has been equal till now, so compare sizes;
			return size>right.size;
		}

		bool operator<(const Rotarray& right) const{
			int sizeCompare=min(size,right.size);
			for(int i=0;i<sizeCompare;i++){
				if((*this)[i]!=right[i]){
					return (*this)[i]<right[i];
				}
			}

			return size<right.size;
		}

		bool operator==(const Rotarray& right) const{
			if(size!=right.size)
				return false;

			for(int i=0;i<size;i++){
				if((*this)[i]!=right[i]){
					return false;
				}
			}

			return true;
		}

		bool operator!=(const Rotarray& right) const{
			return !(*this==right);
		}

		bool operator<=(const Rotarray& right) const{

			return !(this>right);
		}

		bool operator>=(const Rotarray& right) const{
			return !(this<right);
		}

		void shiftRight(){
			startIndex++;
			if(startIndex>=size){
				startIndex=0;
			}
		}

		void shiftLeft(){
			startIndex--;
			if(startIndex<0){
				startIndex=size-1;
			}
		}

		void reset(){
			startIndex=0;
		}

		void setStartIndex(int _newStartIndex){
			startIndex=_newStartIndex%size;
		}

};

template<typename T>
ostream& operator<<(ostream& os,const Rotarray<T>& obj){
	if(obj.getSize()<1)
		return os;

	os<<"["<<obj[0];
	for(int i=1;i<obj.getSize();i++){
		os<<","<<obj[i];
	}
	os<<"]";
	return os;
}

#endif