RE: [Dev-C++] 'extern const' and std::vector

[Per W. <pw...@ia...>]

Yes, this exists:
extern const int x;

However, that is a constant. The request - as I read it - was for a global
variable to be const in just one file, while writeable in other files.

When extern-declaring something (that is already declared somewhere else),
you should declare it identical to the original declaration, and it this
case the original declaration is not const.

/Per W

On Thu, 1 May 2003, Ioannis Vranos wrote:

> > -----Original Message-----
> > From: dev...@li...
> > [mailto:dev...@li...] On Behalf
> > Of Per Westermark
> > Sent: Thursday, May 01, 2003 5:23 PM
> > To: David McKen
> > Cc: dev...@li...
> > Subject: Re: [Dev-C++] 'extern const' and std::vector
> >
> >
> > I'm not too good at the latest updates of the standards, but
> > to the best
> > of my knowledge, there is no const extern declarations.
>
>
> Why?
>
>
>
> > Extern is just a keyword to inform the compiler that
> > somewhere in another
> > linking unit, the specified variable or function exists.
> > However, you can
> > not just lie, because when you reference the symbol, the compiler will
> > insert a name-mangled reference and the linker will then fail if an
> > exactly identical reference isn't available somewhere in one of the
> > included object or library files.
>
>
> If you do extern int x;
>
>
> and you do not define x elsewhere, it is considered a definition. The same
> applies for
>
> extern int x=1;
>
>
> It is considered a definition (extern is ignored).
>
>
>
>
>
> Ioannis Vranos
>
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