A screenshot from the linked article titled "Reflection in C++26", showing reflection as one of the bullet points listed in the "Core Language" section

you are viewing a single comment's thread
view the rest of the comments

[–] Zangoose@lemmy.world 6 points 1 month ago* (last edited 1 month ago) (2 children)

There's a pretty big difference though. To my understanding enable_if happens at compile time, while reflection typically happens at runtime. Using the latter would cause a pretty big performance impact over a (large) list of data.

[–] Sonotsugipaa@lemmy.dbzer0.com 2 points 1 month ago (1 children)

Wouldn't compilers be able to optimize runtime things out? I know that GCC does so for some basic RTTI things, when types are known at compile time.

[–] BatmanAoD@programming.dev 6 points 1 month ago (1 children)

For runtime reflection, no, you'd specifically be able to do things that would be impossible to optimize out.

But the proposal is actually for static (i.e. compile-time) reflection anyway, so the original performance claim is wrong.

[–] Sonotsugipaa@lemmy.dbzer0.com 2 points 1 month ago

Yeah, that's what I was thinking of. I don't know how C++ could reasonably have Java-like reflections anyway...

[–] azi@mander.xyz 1 points 1 month ago

C++26 reflection is compiletime