Re: Accessing C++ class method from ObjC++ code

FROM : Charles Hamel
DATE : Sun Nov 18 20:50:40 2007

The definition is exactly the same,  I copied/pasted it just to be sure.

No namespaces involved.

I understand the nature of the error, it really looks like somehow the 
linker doesn't see the analyze method implementation in Vision.mm, 
even if it is included in the target.

What I don't get is that AppController.mm compiles fine, it even 
highlights the vision->analyze(...) statement, so it knows it is a 
valid symbol right ?

I have read the Apple doc many time now and I don't get what's 
missing, is there a way to force the linker with some kind of extern 
statement in my case ?

Thank you

Charles

On 18-Nov-07, at 1:43 PM, stephen joseph butler wrote:

> On Nov 18, 2007 12:31 PM, Charles Hamel <<email_removed>> wrote:

>> Sorry for the confusion

>
> n/p
>

>> Get Info on Vision.mm, then Targets Tab, check the box.

>
> Okay. Are namespaces involved? Are you sure the function signature
> matches? If your header is this:
>
> class Vision {
>      public: void analyze(NSMutableArray* a);
> };
>
> Then your implementation needs to be this:
>
> void Vision::analyze(NSMutableArray* a);
>
> Basically, your error message is telling us something quite simple.
> The linker can't find the implementation of the function you declared
> in the header. Usually this means one of two things:
>
> 1) The implementation file isn't in the target. But it looks like it 
> is.
> 2) The function signature for the implementation doesn't match the 
> declaration.
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