Problem with Function Pointer Parameters in Hdr

[willrich]

Greetings all, I've been trying to resolve the following problem (reduced to its simplest possible form) in which Und sees the declaration in the hdr file as a 'global object' which does not link to the definition in the code file:

Code: Select all

****************************************************
// Test.h

int initCallBack(int (*callBack)(int cmd));

****************************************************
// Test.cpp

#include "Test.h"

int (*callBackP)(int cmd);

// initialize callback
int initCallBack(int (*callBack)(int cmd)) {
   callBackP = callBack;
   return 0;
   }

****************************************************


However, I was able to get it to work correctly by prepending 'extern' to the hdr declaration. I guess my question now is, is this 'expected' behaviour by Und or am I still missing something? It's no big deal but I like things as simple as possible + none of my other hdr decs require 'extern'.

Thanks, Will.

[KevinG]

Hi Will,
I'll check with the engineers on this.
Regards,
KevinG

[KevinG]

I heard back from the engineer on this, it looks like the strict analyzer handles this correctly. This looks like an example of the so-called "most vexing parse" (http://en.wikipedia.org/wiki/Most_vexing_parse). I think that the best way to work around this in the flexible analyzer, without adding something like extern, is to typedef the function pointer type and use that as the parameter type instead.
Regards,
KevinG

[willrich]

Thanks Kevin. While the strict analyzer option did work, I'm not willing to give up the rapidity of the 'fuzzy' parser. I ended up going with the function pointer typedef as you suggested which worked great. Thanks again for your help.

Will