0010.cpp

#include <iostream>
#include <iomanip> 
#include <cstring>
using namespace std;
template <class T>
class CArray3D
{
// 在此处补充你的代码
	class CArray2D{
	private:
		T* _arr_2D;
		int _row,_col;
	public:
		CArray2D():_arr_2D(nullptr),_row(0),_col(0){}
		CArray2D(int r,int c,T* _ptr_arr2D):_row(r),_col(c),_arr_2D(_ptr_arr2D){}
		T* operator[](const int& r){
			return _arr_2D + r * _col;
		}
		operator T*(){
			return _arr_2D;
		} 
	};
private:
	int _layer,_row,_col;
	T* _arr_3D;
public:
	CArray3D():_layer(0),_arr_3D(nullptr){}
	CArray3D(int l,int r,int c):_layer(l),_row(r),_col(c){
		_arr_3D = new T [_layer * _row * _col];
	}	
	CArray2D operator[](const int& l){
		return CArray2D(_row,_col,_arr_3D + l * _row * _col);
	}
};

CArray3D<int> a(3,4,5);
CArray3D<double> b(3,2,2);
void PrintA()
{
	for(int i = 0;i < 3; ++i) {
		cout << "layer " << i << ":" << endl;
		for(int j = 0; j < 4; ++j) {
			for(int k = 0; k < 5; ++k) 
				cout << a[i][j][k] << "," ;
			cout << endl;
		}
	}
}
void PrintB()
{
	for(int i = 0;i < 3; ++i) {
		cout << "layer " << i << ":" << endl;
		for(int j = 0; j < 2; ++j) {
			for(int k = 0; k < 2; ++k) 
				cout << b[i][j][k] << "," ;
			cout << endl;
		}
	}
}

int main()
{

	int No = 0;
	for( int i = 0; i < 3; ++ i ) {
		a[i];
		for( int j = 0; j < 4; ++j ) {
			a[j][i];
			for( int k = 0; k < 5; ++k )
				a[i][j][k] = No ++;
			a[j][i][i];	
		}
	}
	PrintA();
	memset(a[1],-1 ,20*sizeof(int));	
	memset(a[1],-1 ,20*sizeof(int));
	PrintA(); 
	memset(a[1][1],0 ,5*sizeof(int));	
	PrintA();

	for( int i = 0; i < 3; ++ i )
		for( int j = 0; j < 2; ++j )
			for( int k = 0; k < 2; ++k )
				b[i][j][k] = 10.0/(i+j+k+1);
	PrintB();
	int n = a[0][1][2];
	double f = b[0][1][1];
	cout << "****" << endl;
	cout << n << "," << f << endl;
		
	return 0;
}