Mindboards

Hi,
I want to use a menu like the standard menu from NXT 2.0 brick.
Unfortunately I can't find a system call to reuse the existing one

Therefore I tried to implement my own, but it I couldn't declare a function pointer:
typedef struct {
string label;
string ricPath;
bool (*onEnter)(int *item); // compile error
} MenuItem;

Q1:
Doesn't support NXC function pointer at all?
If so, is there any "trick" to deal with something like a callback?
(Sorry if it is a stupid question - I'm not a C developer)

Q2: How can I define struct types which depends on each other ?
typedef struct { B b; } A;
typedef struct { A a; } B;
// In my case: "Menu" contains "MenuItem" and "MenuItem *could* contain a "Menu" (as sub-menu)

Thanks in advance
Thomas

Not eXactly C is basically C without pointers (and a few other differences). So you can't. (I'm not familiar with function pointers in C though.)

However I think it might be possible in the FW. I'm no expert on the NXT FW bytecode, but I think a variable is used to represent the function, perhaps you could change the value of this variable for interesting results?

The NXT virtual machine does not support function pointers or recursively defined structures. As a result, neither does NXC.

John Hansen