Assuming structs are cheap to copy?

Justin Johansson noreply at jj.com
Mon Jan 10 06:08:51 PST 2011


On 10/01/11 03:06, Peter Alexander wrote:
> I remember there was a discussion a little while back about how Phobos
> would assume that structs are cheap to copy, and would simply pass them
> by value.
>
> Is this assumption now "the D way"? Should we all just pass structs by
> value, assuming cheap copy construction?
>
> If so, I think this needs to be documented somewhere (assuming it isn't
> already), because it's a radical departure from C++, and also from most
> other languages (where everything is a reference type). People need to
> be aware of this.

What if the byte size of some struct is say a KB or a MB would one still 
think that copy construction is cheap?

In this instance I would not blame poor performance on Phobos but rather 
than your own design.

Cheers
Justin



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