Re: Can remove AA elements during foreach?

[Steven Schveighoffer]

On Sat, 16 Feb 2013 18:59:59 -0500, Nick Sabalausky  
<seewebsitetocontac...@semitwist.com> wrote:

Is this both legal and safe?:
    foreach(key; assocArray)
    if(key != "foobar")
        assocArray.remove("foobar");

If not, then what about this?:

    foreach(key; assocArray.byKey())
    if(key != "foobar")
        assocArray.remove("foobar");


Both are unsafe.

Note that with Dcollections, there is a special purge feature that allows  
safe removal while traversing:

foreach(ref doPurge, key, value; &hashMap.purge)
    doPurge = (key != "foobar");

All dcollections' classes support this.

There is a keys collection, but that does not support purge.  I can  
actually add it pretty easily though...

-Steve