Example array of class

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C++

How make array of class? Give me some example...

Posted 26-Mar-14 16:03pm

JaironLanda

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PJ Arends 26-Mar-14 22:28pm

Use std::vector< myclass>;

4 solutions

Solution 3

You can do on stack or heap using arrays or pointers. Std::vector is excellent option.

C++

#include <iostream>
#include <vector>

using namespace std;

class MyClass
{
public:
	MyClass() {};
	MyClass(const int val) : myVal(val) {};
	int getVal() { return myVal;}; 
private:
	int myVal;
};

int main()
{
	const int arraySize = 10;

	// You can create on stack like so (which is not always a good idea)
	MyClass myArray[10];

	////////////////////////////////////////////////////////////////////
	// Better is to use heap and pointers.
	MyClass **classptr = new MyClass *[arraySize];

	for(int i = 0; i < arraySize; i++)
		classptr[i] = (MyClass *) new  MyClass(i);

	for(int i = 0; i < arraySize; i++)
		cout << classptr[i]->getVal() << endl;

	for(int i = 0; i < arraySize; i++)
		delete  classptr[i];

	delete classptr;

	//////////////////////////////////
	// Or you can use vector
	vector <MyClass *> myVector;

	for(int i = 0; i < arraySize; i++)
	{
		MyClass *myClass  = new  MyClass(i);
		myVector.push_back(myClass);
	}

	for(int i = 0; i < arraySize; i++)
		cout << myVector[i]->getVal() << endl;

	for(int i = 0; i < arraySize; i++)
		delete  myVector[i];

}

Posted 26-Mar-14 18:18pm

User 59241

Updated 26-Mar-14 18:41pm

v3

Comments

Mohibur Rashid 27-Mar-14 2:20am

OP is still far away to understand vector. +5 for your effort

[no name] 27-Mar-14 2:27am

Thank you sir.

Solution 1

Refer: Example[^]

Posted 26-Mar-14 16:38pm

Peter Leow

Solution 2

Array of classes Video[^].

Posted 26-Mar-14 17:11pm

Abhinav S

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Krunal Rohit · Accepted Answer · 2014-03-26T18:23:00

A class by itself, such as the Dog class from the "Classes" tutorial, is quite useless. To make good use of such a class for video game programming purposes we need to be able to group several of them, this way we can minimize code when it comes to controling several objects at a time. This can be done by creating an Array of the object just like you would with any other data type. I will be splitting this programming up into several files as well, this will help keep things organized once your programs get bigger. Heres the example code:

C++

//Dog.h
#ifndef DOG_H
#define DOG_H 1

class Dog{

public:

	Dog();
	int getAge();	
	void setAge(int newValue);

protected:
	int age;


};

#endif

This is the header file for the Dog class, it simply holds the prototype for the class, the actual code will be in a seperate file, Dog.cpp. The "#ifndef DOG_H" line is used to make sure Dog isnt declared twice.

C++

//Dog.cpp
#include "Dog.h"

Dog::Dog(){

}

int Dog::getAge(){

    return age;

}

void Dog::setAge(int newValue){

    age = newValue;

}

Dog.cpp first includes its header file in order to have the prototype for the class, the code here should be familiar from the last lesson.

C++

//main.cpp
#include <iostream>
#include "Dog.h"

using namespace std;

int main()
{
    
    Dog myDogs[5];
    
    for (int i = 0; i <= 4; i++)
        myDogs[i].setAge( i * 2);
    
    for (int i = 0; i <= 4; i++)
        cout << "Dog number " << i << " is " << myDogs[i].getAge() << " years old!\n";
        
    delete [] myDogs;
    
    return 0;
}</iostream>

main.cpp holds the code for the actual program. It only needs to include the header file for the class, not the actuall code file (Dog.cpp). Dog myDogs[5]; simply creates an array of 5 Dogs, just like using any other built in data type.
In order to access each individual Dog, simply include its index number in the brackets, and use it as you would any normal class. This example simply sets their age and displays it.

-KR