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

[Ioannis V. <iv...@at...>]

> -----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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