error: conflicting types for 'myFunctionOne'

[MarkB_CTC]

Hello,

The LabWindows/CVI 2013 help page for C Language Extensions appears to show function overloading being supported in the C99 extensions:

 "Function Overloading in C | Yes"

The table in the following link shows the same thing:

http://digital.ni.com/public.nsf/allkb/73AEAD30C8AF681A86257BBB0054A26B

I tried compiling a source file with the following overloaded function definitions with C99 extensions enabled in the Build Options:

 void myFunctionOne(double d) {
  printf ("Value = %f\n", d);
 }

 void myFunctionOne(int d) {
  printf ("Value = %d\n", d);
 }

and I get the error:

 "conflicting types for 'myFunctionOne'

Is function overloading truly supported, and if so, how does one enable it?

Thanks,
Mark B.

[Wolfgang]

Oh, I was a bit too quick, Constantin has the better answer

[Constantin--P · Accepted solution]

Hello Mark,

You have to add __attribute__((overloadable)) at the definitions of the functions you want to overload.

void __attribute__((overloadable)) myFunctionOne(double d) {
  printf ("Value = %f\n", d);
}

void __attribute__((overloadable)) myFunctionOne(int d) {
  printf ("Value = %d\n", d);
}

You can see an examples of clang extensions here.

Constantin

[MarkB_CTC · Accepted solution]

Thanks, Constantin.  Works perfectly.  Looks like there's a whole world of attributes out there - I see a research project in my future.

Wolfgang, thanks for taking the time to reply, also.

Best regards,

Mark B.

[gdargaud]

I think you can also use the 'weak' attribute and/or pragma, although I haven't tried.

[MarkB_CTC]

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@gdargaud wrote:

I think you can also use the 'weak' attribute and/or pragma, although I haven't tried.

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Thanks, I'll look into it.

Mark