From: Jason Green <news AT jgreen4 DOT fsnet DOT co DOT uk>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: inline operator bug ?
Date: Fri, 04 May 2001 23:33:09 +0100
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"Rafal Maj" <maj_rafal AT poczta DOT onet DOT pl> wrote:

> I have found some problems with using inline operators and I think that it
> might be a bug.
> This bug can only be seen in projects, so my example program has 3 files :
> ****** file bug1lib.h ******
>   class cA { public : inline void operator +(int); } ;
> ****** file bug1lib.cc *******
>   #include "bug1lib.h"
>   inline void cA::operator +(int) { };
> ****** bug1m.cc ******
>   #include "bug1lib.h"
>   int main() { cA a;  a+2; }
> 
> After building this project I get output like this :
>   Compiling: bug1lib.cc   no errors
>   Compiling: bug1m.cc   no errors
>   Creating: bug1.exe
>    Error: bug1m.o: In function `main':
>   Error: bug1m.cc(.text+0x10): undefined reference to `cA::operator+(int)'
>   Error: collect2: ld returned 1 exit status
> 
> After removing inline from bug1lib.cc & bug1lib.h everything is working
> correct.

This is expected behaviour.

To be inlined, the function must be visible at compile time whenever it
is used.  So the code can either be:

****** file bug1lib.h ******
class cA { public : void operator +(int) {/*...*/} } ;
****** bug1m.cc ******
#include "bug1lib.h"
int main() { cA a;  a+2; }

or:

****** file bug1lib.h ******
class cA { public : void operator +(int); } ;
inline void cA::operator +(int) {/*...*/};
****** bug1m.cc ******
#include "bug1lib.h"
int main() { cA a;  a+2; }