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Q: how to store a box2d b2FixtureDef fixtureDefinition into a NSArray in Xcode I've got some issues wrapping an application, developed through netbeans 8 in html5 and javascript, into PhoneGap to make it playable also on iOS devices. So (since it's anyway a matter i want to learn) I'm trying a port to the iOS native Objective-C language in Xcode. I could already re-write some Javascript functions, but as I came in need to store some of my Box2D objects and structs into arrays or dictionaries I started to feel lost. my situation is like this: in Javascript i can make arrays to store all the objects and fixtures i need to create in this way: function createBoxStart(){ //create three objects when game starts for (i = 0; i < '...number of objects i need'; i++) { var start = {x: '...some operation to get my x', y: '...some operation to get my y'}; var fixDefContainer = new Array(); fixDefContainer['fixDef'+prodNum] = new box2d.b2FixtureDef; fixDefContainer['fixDef'+prodNum].density = 10; fixDefContainer['fixDef'+prodNum].friction = 10 ; fixDefContainer['fixDef'+prodNum].restitution = myBox[prodNum].reflection; var bodyDefContainer = new Array(); bodyDefContainer['bodyDef'+prodNum] = new box2d.b2BodyDef(); bodyDefContainer['bodyDef'+prodNum].type = box2d.b2Body.b2_dynamicBody; bodyDefContainer['bodyDef'+prodNum].position.x = start.x /scale; bodyDefContainer['bodyDef'+prodNum].position.y = start.y /scale; bodyDefContainer['bodyDef'+prodNum].gravityScale = myBox[prodNum].g; bodyDefContainer['bodyDef'+prodNum].linearDamping = myBox[prodNum].lDamp; bodyDefContainer['bodyDef'+prodNum].angularDamping = myBox[prodNum].angDamp; bodyDefContainer['bodyDef'+prodNum].userData = coinBox[prodNum].userName ; fixDefContainer['fixDef'+prodNum].shape = new box2d.b2CircleShape(coinBox[prodNum].size/scale); myBody[prodNum] = bodyDefContainer['bodyDef'+prodNum]; myBody.id = myBody[prodNum].userData; myObj[prodNum] = world.CreateBody(bodyDefContainer['bodyDef'+prodNum]); myObj[prodNum].CreateFixture(fixDefContainer['fixDef'+prodNum]); prodNum++; ..... ..... }...} However in Xcode I've to create a "NSArray* myArray" object, and also, as long I've made it, I found out I cannot store any C++ objects into it without wrapping them before. I'm still trying to make it work using the NSValue class as i saw in some tutorials, but also i totally don't know yet how to store the fixtures, since they're neither initialized with a pointer. Here is how i create the "myFixDef" object, and since it has not a "*" i cannot wrap it into the NSVAlue class. b2FixtureDef myFixDef; Thanks in advance for any help and suggestion A: A b2FixtureDef is really just a collection of properties like friction, restitution, density etc. You can store that in an Obj-C structure if it's easier, and then just set the properties in a b2FixtureDef when you need to create a fixture.