Thinking about this a bit more, maybe the memory cost could go away with tagged pointers. That is easier to do on a 64-bit platform though.
Eric On Mar 13, 2014, at 1:37 PM, Eric Summers <eric.summ...@me.com> wrote: > Yes, but with tags you pay the cost even if Option is None. > > Eric > > On Mar 13, 2014, at 1:33 PM, Daniel Micay <danielmi...@gmail.com> wrote: > >> On 13/03/14 02:25 PM, Eric Summers wrote: >>> Also this approach uses more memory. At least a byte per pointer and >>> maybe more with padding. In most cases like this you would prefer to >>> use a vtable instead of tags to reduce the memory footprint. >>> >>> Eric >> >> A vtable uses memory too. Either it uses a fat pointer or adds at least >> one pointer to the object. >> > > _______________________________________________ > Rust-dev mailing list > Rust-dev@mozilla.org > https://mail.mozilla.org/listinfo/rust-dev _______________________________________________ Rust-dev mailing list Rust-dev@mozilla.org https://mail.mozilla.org/listinfo/rust-dev
