Re: [Boost-users] [string_algo]find_head/find_tail additions

From: Pavol Droba (droba_at_[hidden])
Date: 2005-12-02 03:05:58

On Fri, Dec 02, 2005 at 07:47:16AM +0000, Martin wrote:
> Pavol Droba <droba <at> topmail.sk> writes:
> 
> > 
> > Hi,
> > 
> > This seems like a goot idea. I like the interface with int parameter.
> > I'll add it to my todo list.
> > 
> > Thanks,
> > Pavol
> 
> What's wrong with erase_tail_copy?

Well, you got me. It's a shame, but I have forgotten, that there is already 
function for this. My response was make without consideration of the existence
of erase_tail/head.

Given this, I see no futher reason to modify behaviour of find_head.

> 
> Don't like the idea with negative numbers becuse I can't see how code can use 
> the functionality. Either you want the to use the positive version or the 
> negative version and then it can be different functions. Combining it into the 
> same function doubles the size and might affect inlining, optimization etc.
> 

Actualy the usage of negative numbers in indexation of string ranges is quite common
in scripting world. For example ruby and perl do have something like this.

> What about find_nth?
> 

It would make sence to do the same here, but only if other algorithms like find_head
would be modified as well. 
As I see that there is no reason for former, I will not modify the later.

Best regards,
Pavol