NetNews Offline 2/NetNews Offline Volume 2.iso/news/comp/lang/c++-part1/4950

Internet Message Format | 1996-08-06 | 1.9 KB

Path: geraldo.cc.utexas.edu!usenet
From: Richard Kilgore <[e-mail]>
Newsgroups: comp.lang.c++
Subject: Re: So I have this pointer-to-member function...
Date: 1 Feb 1996 19:18:03 GMT
Organization: The University of Texas at Austin, Austin, Texas
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Scott Mayo wrote:
> The compiler will have none of it. It takes one glance at the static struct
> {char*name; void (C::*f)();} list[] = {"A", C::A}; and has a hissy fit at the
> attempt to assign initializers. It's fine outside the class definition; it
> won't work inside.

Yes, C++ doesn't allow you to initialize any data members inside the class
declaration, b/c it views any members inside as declarations, not definitions.
Like an extern.  Even if you decided to leave it uninitialized and just set
its contents later somewhere, the linker would complain that it can't find a
definition for "list".

I suggest you give the structure a name, and then inside the class declaration
you can use something like:

    struct mystruct {char*name; void (C::*f)();};
    struct mystruct list[];

And then in your .cc file, you can initialize it with something like:

    struct C::mystruct C::list[] = { <whatever> };

There might be a shortcut to avoid the struct name if you don't want it, but
as long as you get the idea about the initialization.  No matter what kind of
static data member you have, you'll have to define and initialize it in the
cc file (or .cpp if your a windoze user).

    - rick

--
Richard B. Kilgore
Grad Student, University of Texas at Austin
WWW URL: http://lore.ece.utexas.edu/~rkilgore/
E-mail [e-mail]