Tuple enhancement

[Temtaime via Digitalmars-d]

On Sunday, 16 October 2016 at 20:11:01 UTC, Chris Wright wrote:
> On Sun, 16 Oct 2016 18:51:06 +0000, Sebastiaan Koppe wrote:
>
>> On Sunday, 16 October 2016 at 13:58:51 UTC, Andrei 
>> Alexandrescu wrote:
>>> I was thinking it would be handy if tuples had a way to 
>>> access a field by name at runtime. E.g.:
>>>
>>> Tuple!(int, "a", double, "b") t;
>>> string x = condition ? "a" : "b";
>>> double v = t.get!string(x, 3.14);
>> 
>> That would mean that tuple then needs to keep the strings 
>> around - taking up space.
>
> It doesn't change Tuple.sizeof.
>
>> That plus the fact that the following code is
>> equivalent (obviously):
>> 
>> Tuple!(int, "a", double, "b") t;
>> double v = condition ? t.a : t.b;
>> 
>> Why this addition? What does it enable?
>
> It's a little bit of runtime reflection, which people sometimes 
> find handy. There's nothing stopping you from writing it 
> manually or with metaprogramming, granted. And if it's just 
> tuples, it doesn't seem like much of an advantage.

Please, not. We already have great compile time reflection.