New linked list

[Chris Miller]

On Thu, 11 May 2006 15:06:23 -0400, Walter Bright  
<newshound at digitalmars.com> wrote:

> Sean Kelly wrote:
>> Walter Bright wrote:
>>> Sean Kelly wrote:
>>>> Very cool.  One thing... does this work:
>>>>
>>>>     foreach( Person p; per.each )
>>>>     {
>>>>         if( p.age > 50 )
>>>>             p.listRemove();
>>>>     }
>>>>
>>>> ie. can you remove elements within a foreach?
>>>
>>> It's undefined behavior. foreach is entitled to assume that the  
>>> aggregate is a loop invariant, although the contents of the  
>>> aggregate's elements can change. This precludes things like resizing  
>>> an array inside a foreach, etc.
>>  Even for a class that defines an opApply?
>
> Yes. The idea is to apply uniform semantics.

Makes sense. Perhaps I should add a filter() function that calls back a  
delegate for each item and allows you to remove items safely.