[boost] Re: Re: Re: [review results] hash functions accepted

From: Thorsten Ottosen (nesotto_at_[hidden])
Date: 2005-03-23 13:35:26

"Jonathan Wakely" <cow_at_[hidden]> wrote in message 
news:20050323180511.GA54619_at_compsoc.man.ac.uk...
| On Wed, Mar 23, 2005 at 06:15:14PM +0100, Thorsten Ottosen wrote:
|
| > "Jonathan Wakely" <cow_at_[hidden]> wrote in message
| > news:20050323165335.GA52151_at_compsoc.man.ac.uk...
| > | On Wed, Mar 23, 2005 at 04:06:09PM +0000, Joaquin M Lopez Munoz wrote:
| > |
| > | > "I can't think of any way that this extension could
| > | > break a conforming program, considering that users
| > | > are not permitted to forward-declare standard
| > | > library components"
| > | >
| > | > Is this really so? Why cannot I forward declare a
| > | > stdlib component?
| > |
| > | Opening namespace std for anything except specialisations of standard
| > | library templates (with user-defined types as parameters) is illegal.
| >
| > yes, but why?
|
| Because the Standard says so!  :-)

yes, I know that...I was interesting in examples of *how* we can break
programs with forward declarations.

-Thorsten