Programming Megathread

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SubDaWoofer:
yet again i am trying to into code again and yet again i forget how classes work
note: using C++ this time

Pecon:

--- Quote from: SubDaWoofer on February 16, 2017, 05:02:58 PM ---yet again i am trying to into code again and yet again i forget how classes work
note: using C++ this time

--- End quote ---
Classes are the 'formal' way of making objects in C++ (the 'informal' way is via a struct). They provide slightly more functionality than structs and are written a little more verbosely. Basically you define the class and specify all the values and methods of that object.

--- Code: ---class thingHandler
{
public int things;
private bool thingsAreHandled = false;

public void handleThings(); // member function
}

// Constructor method
thingHandler::thingHandler(int start)
{
things = start;
}

void thingHandler::handleThings()
{
thingsAreHandled = true;
}

int main()
{
thingHandler TH = new thingHandler(20);

TH.handleThings();

TH.things += 10;
}

--- End code ---

Thanks for the corrections, Headcrab.

Headcrab Zombie:

--- Quote from: Pecon on February 16, 2017, 08:50:30 PM ---It's been a while since I wrote any C++ so I'm not 100% sure if the 'new' declaration is right.

--- End quote ---
It would be thingHandler TH = new thingHandler(20);

Also you want the constructor declaration either inside the class, or prepended with thingHandler::. And it doesn't have any return type (not even void):

thingHandler::thingHandler(int start)
{
things = start;
}

SUSHI:

--- Quote from: Pecon on February 16, 2017, 08:50:30 PM ---They provide slightly more functionality than structs

--- End quote ---

Not really. The only difference between a structure and a class is that by default, a structures members are public and it also publicly inherits it's base class.

When creating a class using new, it will not be deleted when it goes out of scope. You must delete it some point when you're finished with it, or you will leak memory.

--- Code: ---thingHandler TH = new thingHandler(20);
TH.handleThings();
TH.things += 10;
delete TH;

--- End code ---

You can also create your class with automatic storage duration, which will handle cleanup automatically when it goes out of scope.

--- Code: ---thingHandler TH(20);
TH.handleThings();
TH.things += 10;

--- End code ---

Metario:

--- Quote from: SUSHI on February 16, 2017, 11:14:06 PM ---When creating a class using new, it will not be deleted when it goes out of scope. You must delete it some point when you're finished with it, or you will leak memory.

--- End quote ---
oops

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