`in` parameters made useful

James Blachly james.blachly at gmail.com
Sun Aug 23 17:35:23 UTC 2020

On 8/5/20 3:27 AM, Fynn Schröder wrote:
> On Friday, 31 July 2020 at 21:49:25 UTC, Mathias LANG wrote:
>> I hope this will generate interest with people hitting the same problem.
> I've literally yesterday written some new code with `const scope ref` in 
> almost every function to pass large, complex structs. Occasionally, I 
> had to store rvalues temporarily to pass as lvalues (non-templated 
> code). I would rather simply put `in` on those parameters :-) It's a lot 
> easier to grasp function signatures only using `in` and `out` on 
> parameters (and their effect/purpose being immediately obvious to new D 
> programmers!)

Sorry to interject d.D.learn material in this thread, but where is 
"scope ref" documented? I found 
https://dlang.org/spec/function.html#scope-parameters which discusses 
the use of `scope` with ref type parameters, but the example given is 
pointer-based. Is it correct that `scope ref T` behaves the same as 
`scope T*` ?

DIP1000 shows as "superseded"

I am glad D is iterating and improving on safety, but I have found that 
documentation may not well recent changes in this area.

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