Does rust have small size optimized strings (and arrays)?
And are these iterator compatible?
In the standard library the implementation looks straightforward, so I'm guessing it doesn't have that optimization:
- https://doc.rust-lang.org/src/collections/up/src/libcollections/string.rs.html#261-263
- https://doc.rust-lang.org/beta/src/collections/up/src/libcollections/vec.rs.html#295-298
There's a crate for small strings: https://crates.io/crates/inlinable_string
Also note that slices (including &str) use fat pointers to store length, so for them there's no extra storage overhead.
Types can be made compatible with iterators by implementing traits such as Iterator/IntoIterator, so standard library strings are not special in that regard.
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See this thread:
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