From: "Rafal Maj" <maj_rafal AT poczta DOT onet DOT pl>
Newsgroups: comp.os.msdos.djgpp
Subject: Odp: static
Date: Thu, 3 May 2001 17:24:37 +0200
Organization: Academic Computer Center CYFRONET AGH
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

After short lecture of "Symphony of C++" I realise, that I just forgot to
put declaration of my static variable outside class definition ;).
But, ther still is small bug in DJGPP : my first example - with missing
declaration outside class and with function body inside class - is compiling
without any errors or warnings ?!

class cA {
  public : static int a;
  public : static void f();
};
int cA::a; // <- :)
void cA::f() { a=3; }
int main() { }

Użytkownik Rafal Maj <maj_rafal AT poczta DOT onet DOT pl> w wiadomości do grup
dyskusyjnych napisał:9cre3n$4bq$1 AT info DOT cyf-kr DOT edu DOT pl...
> (Please, I need to get answer fast - if You can help me)
> I didn't use static for long time, so I have totaly forgoten how to use it
> :-(
>
> Why this code :
>   class cA {
>      private : static int a;
>      public : static void f();
>   };
>   void cA::f() { a=3; }
>   int main() { }
> gives me this error message :
>   Creating: a.exe
>   Error: a.o: In function `cA::f(void)':
>   Error: a.cc(.text+0x5): undefined reference to `cA::a'
>   Error: collect2: ld returned 1 exit status
> Why after moving body of static function inside class definition
everything
> is allright :
>   class cA {
>     private : static int a;
>     public : static void f() { a=3; }; // ok
>   };
>   // void cA::f() { a=3; } - error
>   int main() { }
>
> How to write this small example correct ? I must have funciton body
outside
> of class definition, because I want this class to be splited into .cc and
.h
>
> Thanks in advice....
>
>