Re: Collection, why COW collection are important

[Gary Willoughby via Digitalmars-d]

On Saturday, 31 October 2015 at 23:02:12 UTC, deadalnix wrote:

The hack team recently released project to add COW collection to hack in addition to current, reference type, collections. You can find explanation here :

http://hhvm.com/blog/10649/improving-arrays-in-hack

As collection are discussed here, I think this is relevant, especially the explanations as of why COW matters.

What does COW mean here?