Re: [Boost-users] [multi_array] operator= requires resize - why?

From: Ronald Garcia (garcia_at_[hidden])
Date: 2007-01-16 10:59:23

Hello Markus,

On Jan 16, 2007, at 9:06 AM, Markus Werle wrote:

> IMHO the behaviour of operator= for multi_array is a little bit  
> broken.
> A lot of preconditions required:

Indeed operator= for multi_array requires the sizes of the  
multi_arrays to match, hence the assertions.  The multi_array type is  
not meant to automatically resize when assigned to.  All resizing is  
intentionally meant to be explicit.
For your application, you will need to resize your array prior to  
assignment.

>
> Besides the fact that I get mad about asserts instead of exceptions
> (please change this to a way users may choose) why do we have such  
> an odd
> behaviour here?
>

I'm afraid that we do not agree about the place for asserts versus  
exceptions.  The assertions in operator=() enforce library  
preconditions regarding assignment.  See the document http:// 
boost.org/more/error_handling.html under "What about programmer errors?"

Regards,
ron