`ExactSizeIterator` for `slice::Iter`?

libs
1

Correct me if I'm wrong. I couldn't find the trait when reading std/core lib source code.

[T] has a len method (which, for some reason, is const??? how is that even possible?)

Iter has the field end_or_len. So it seems the trait could be compatible.

Related: Why doesn't `Vec` implement `ExactSizeIterator` - The Rust Programming Language Forum

2

It’s in the docs, so it must be in the source somewhere.

3

const in this context means "callable during compile time".

4

That should be documented somewhere. If it isn't, where should I open a PR?

5

I should've wrote this earlier :sweat_smile:

6

https://doc.rust-lang.org/nightly/reference/const_eval.html#const-functions

7

I was reading this and I finally understood what it means: Despite ptr::metadata being const unstable, there's an attribute that tells the compiler to ignore the instability

8

Thanks to everyone who replied! And I'm sorry for the off-topic questions.

This thread can be closed now