[D-runtime] dup attributes?

[Steve Schveighoffer]

One more thing -- concatenation suffers from the same problem.  This one might 
be much harder to swallow since you may have to do N flag lookups.

-Steve



----- Original Message ----
> From: Steve Schveighoffer <schveiguy at yahoo.com>
> To: d-runtime <d-runtime at puremagic.com>
> Sent: Wed, August 4, 2010 8:32:38 AM
> Subject: [D-runtime] dup attributes?
> 
> Currently, in the array runtime code, all appends and length settings copy the 

> BlkAttr attributes from the existing block to the new block.  This is  
>important 
>
> if you set block attributes other than the default, or you are  appending to a 

> block which is currently typed differently than what it was  when allocated.
> 
> However, the one function which does *not* do this is  dup.  dup uses the 
> typeinfo to determine the block attributes,  including the NO_SCAN flag.
> 
> I think it should copy the attributes like  all the other functions do.  
>However, 
>
> there is one caveat to  this.  Currently dup doesn't look up the block 
>attributes 
>
> of the  existing data, because it doesn't have to.  So changing dup to copy the 
>
> attributes would slow down dup a bit because in addition to allocating a new 
> block, it must look up the flags for the old block.
> 
> What do you guys  think?
> 
> -Steve
> 
> 
> 
>       
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