casting in gdb

["Jacques Le Normand" <jacqueslen at sympatico dot ca>]

 That explains alot, thanks
 Would you know how to tell g++ to keep all the methods, even when they're
 not used?
 Say I have a map<string,int> m, how would I get gdb to display m["foo"] ?
It
 gives me the silly "function expects something else" error, which I can
 understand since gdb won't cast from char* to string. I'm guessing I need
to
 define my own subroutines.
 --Jacques
> ----- Original Message -----
> From: "Daniel Jacobowitz" <drow@mvista.com>
> To: "Jacques Le Normand" <jacqueslen@sympatico.ca>
> Cc: "Daniel Berlin" <dberlin@dberlin.org>; <gdb@sources.redhat.com>
> Sent: Saturday, December 14, 2002 2:35 AM
> Subject: Re: casting in gdb
>
>
> > On Fri, Dec 13, 2002 at 02:43:17PM -0500, Jacques Le Normand wrote:
> > > here you go, thanks for lending a hand...
> > >
> > > [countchocula@chocoland countchocula]$ g++ -ggdb test.cpp -o test.o
> > > [countchocula@chocoland countchocula]$ gdb test.o
> > > GNU gdb Red Hat Linux (5.2.1-4)
> > > Copyright 2002 Free Software Foundation, Inc.
> > > GDB is free software, covered by the GNU General Public License, and
you
> are
> > > welcome to change it and/or distribute copies of it under certain
> > > conditions.
> > > Type "show copying" to see the conditions.
> > > There is absolutely no warranty for GDB.  Type "show warranty" for
> details.
> > > This GDB was configured as "i386-redhat-linux"...
> > > (gdb) b 10
> > > Breakpoint 1 at 0x80486f5: file test.cpp, line 10.
> > > (gdb) r
> > > Starting program: /home/countchocula/test.o
> > >
> > > Breakpoint 1, main () at test.cpp:10
> > > 10        a.push_back(2);
> > > (gdb) p a[0]
> > > One of the arguments you tried to pass to operator[] could not be
> converted
> > > to w
> > > hat the function wants.
> > > (gdb)
> >
> > This one's pretty simple once you figure it out.  The error message is
> > really bad; I'll hold on to this and try to improve it.
> >
> > Your program doesn't _use_ operator[].  So it doesn't get compiled into
> > the program, and GDB can't call it to figure out what to do.
> >
> > What happens if you add a call to the operator?
> >
> > [I noticed some other quirks; for instance, if your program only uses
> > the mutable version and GDB finds the const version first, it may get
> > confused...]
> >
> > --
> > Daniel Jacobowitz
> > MontaVista Software                         Debian GNU/Linux Developer
> >
>