Question

How can I use NSMutableArray to do something like below done before in C++.

vector BubblePacking (int _state, vector & _location_points, float _bubble_size);

I have created a Point2D class but I don’t know how to make it work as in c++

// ————-Point2D class

@interface EVAPoint2D : NSObject
{
    float x;
    float y;  

}

@property float x,y;

-(void)setXY: (float) xVal: (float) yVal;

@end

// ————-Point2D implementation

@implementation EVAPoint2D
@synthesize x,y;

-(void) setXY:(float)xVal :(float)yVal{
    x=xVal;
    y=yVal;
}

@end

now how can I make let objective-C that I need to create a vector of Point2D elements using NSMutable array

thank you for your answers.

Answer 1

NSMutableArray Class Reference

You have to initialize an NSMutableArray with myArr = [[NSMutableArray alloc] init];.
Then, to add an object, instead of push_back(myPoint), you use [myArr addObject:myPoint].
To access a value, you use [myArr objectAtIndex:i] rather than myVector[i].

Also remember to release your point objects after you add them to the array, and release the array after you are done. (Unless, of course, you are using ARC)