Change Class Types of Objects Returned from C++ Factory Methods

[jtpalmer]

There are several methods, such as b2World::CreateJoint and b2Fixture::GetShape that have a return type that is the abstract base class corresponding to the object that is returned. In XS, we bless the returned objects to this class, not the subclass.

For example, the return type of b2World::CreateJoint is b2Joint. In C++, you can do this:

b2RevoluteJoint* joint = myWorld->CreateJoint(&jointDef);

In Perl, we have to:

my $joint = $world->CreateJoint($jointDef);
bless $joint, 'Box2D::b2RevoluteJoint";

I think it would be better to bless the returned objects directly into the subclass.

[kthakore]

wat about having a Box2Dx::World that has

$world->CreateJoint( $jointDef, "Box2D::b2RevolouteJoint");

[jtpalmer]

The joint type is stored in a public attribute of b2JointDef, so there is no need to specify the class when creating the joint.

[jtpalmer]

b2BodyDef also has a public type attribute that can be used in the same way.