[swift-evolution] MemoryLayout for a value

[Anton Zhilin]

2016-08-04 21:31 GMT+03:00 Dave Abrahams <dabrahams at apple.com>:

>
> on Thu Aug 04 2016, Anton Zhilin <antonyzhilin-AT-gmail.com> wrote:
> > Two weeks ago Adrian and I suggested adding dynamic 'size', 'stride',
> > 'alignment' to Mirror, which definition would look like:
> >
> > public struct ReflectionWrapper {  // fixed!
> >     internal metatype_: Any.Type
> >
> >     public init<T>(_: T.Type)
> >
> >     public var size: Int { get }
> >     public var stride: Int { get }
> >     public var align: Int { get }
> >
> >     // ...
> > }
> >
> > There are some problems with it right now, but I do believe that
> reflection
> > API is where dynamic `size`, `stride`, `alignment` belong.
>
> I see your point, but that would unfortunately be an unacceptably
> expensive way to get that information.  Constructing a mirror is a
> nontrivial bit of work.


I don't mean current heavyweight Mirror. Call that type ReflectionWrapper,
if you want. It would only contain 'Any.Type' stored property.
Largest of 'problems' that I meant is that reflection is postponed, and my
type would look odd without full reflection capabilities (only with 'size'
and friends).
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