Apple

I have this object definition:

@interface BTreeNode : NSObject

{

NSObject *item;

BTKey *key;

BTreeNode *left;

BTreeNode *right;

}

@property (assign) NSObject *item;

@property (assign) BTKey *key;

@property (assign) BTreeNode *left;

@property (assign) BTreeNode *right;

I have a method that has this signature:

-(void) insert: (BTreeNode **) node node:(BTreeNode *) n;

I'm trying to do this:

-(void) insert: (BTreeNode **) node node:(BTreeNode *) n

{

…

// get the address of the left member

[self insert:&[(*node) left] node:n]; // <--- error

}

The compiler(GCC 4.2 or LLVM 1.6) is giving this error : address _expression_ must be an lvalue or a function designator.

I was assuming the return value for [[(*node) left]] is a lvalue (it's a pointer) and I should be able to obtain the address of that pointer but either you can't or the value returned from the message call to node is not a lvalue.

This, [(*node) left], returns the correct object; however, I need to know the address of the object to pass in. What is the proper syntax?

Thanks in Advance,