Proposal: Relax rules for 'pure'

[Steven Schveighoffer]

On Wed, 22 Sep 2010 15:21:57 -0400, klickverbot <see at klickverbot.at> wrote:

> On 9/22/10 9:14 PM, Steven Schveighoffer wrote:
>> Hypothetical counter-case
>>
>> struct S
>> {
>> version(stronglypure)
>> string s;
>> else
>> char[] s;
>> }
>>
>> pure foo(S s); // changes strength depending on S' contents
>>
>> -Steve
>
> This is a change to the signature of foo – S with the stronglypure  
> version defined and S without it are two completely distinct types.

Wait, I didn't change foo's signature at all.  This is what the OP meant  
by long-range changes.  S can be defined far away from foo, and out of the  
author of foo's control.

-Steve