C++ - Dynamic 3D Arrays using Quadruple Pointer Template Functions
Many programmers are hesitating to use the pointers because of complexity and memory management. Nevertheless it is a powerful feature in C++ and gives more control to the programmers.
In this sample code, I have explained how to create and delete a 3-Dimensional dynamic array using a temple functions Create3D_Array and Delete3D_Array
Source Code
#include "stdafx.h"
#include <iostream>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
template<class Type>
int Create3D_Array(Type ****pResult, int x, int y, int z)
{
Type ***p = new Type **[x];
for(int i = 0; i < x; i++)
{
p[i] = new Type *[y];
for(int j = 0; j < y; j++)
p[i][j] = new Type[z];
}
*pResult = p;
return x * y * z;
}
template<class Type>
int Delete3D_Array(Type ****pResult, int x, int y, int z)
{
Type ***p = *pResult;
for(int i = 0; i < x; i++)
for(int j = 0; j < y; j++)
delete p[i][j];
for(int i = 0; i < x; i++)
delete p[i];
delete p;
return 0;
}
void TestFunc()
{
int ***pInt = NULL;
float ***pFloat = NULL;
Create3D_Array(&pInt, 2, 4, 6);
Create3D_Array(&pFloat, 2, 3, 5);
int count = 0;
for(int i = 0; i < 2; i++)
{
for(int j = 0; j < 3; j++)
for(int k = 0; k < 5; k++)
pFloat[i][j][k] = count += 3;
}
for(int i = 0; i < 2; i++)
{
for(int j = 0; j < 3; j++)
{
for(int k = 0; k < 5; k++)
{
char buf[512];
sprintf(buf, "Array[%d][%d][%d] = %.2f\n", i, j, k, pFloat[i][j][k]);
std::cout << buf;
}
}
}
Delete3D_Array(&pFloat, 2, 3, 5);
Delete3D_Array(&pInt, 2, 4, 6);
}
Output
Array[0][0][0] = 3.00
Array[0][0][1] = 6.00
Array[0][0][2] = 9.00
Array[0][0][3] = 12.00
Array[0][0][4] = 15.00
Array[0][1][0] = 18.00
Array[0][1][1] = 21.00
Array[0][1][2] = 24.00
Array[0][1][3] = 27.00
Array[0][1][4] = 30.00
Array[0][2][0] = 33.00
Array[0][2][1] = 36.00
Array[0][2][2] = 39.00
Array[0][2][3] = 42.00
Array[0][2][4] = 45.00
Array[1][0][0] = 48.00
Array[1][0][1] = 51.00
Array[1][0][2] = 54.00
Array[1][0][3] = 57.00
Array[1][0][4] = 60.00
Array[1][1][0] = 63.00
Array[1][1][1] = 66.00
Array[1][1][2] = 69.00
Array[1][1][3] = 72.00
Array[1][1][4] = 75.00
Array[1][2][0] = 78.00
Array[1][2][1] = 81.00
Array[1][2][2] = 84.00
Array[1][2][3] = 87.00
Array[1][2][4] = 90.00
|
|