Hi, I'm a bit puzzled by "scope" of "use". The following program doesn't compile, the line use rayon::iter::ParallelIterator; must be placed before usage of par_iter() and in the top section. The only dependency is rayon = "1.2.1" Code: use rayon::iter::IntoParallelRefIterator; use std::fs; us…

[image] lwojtow: Why doesn't the same rule apply to other 'use' ? Why do I need 'use rayon...' in both places: top of the file and method? The two uses are different. use rayon::iter::IntoParallelRefIterator; use rayon::iter::ParallelIterator; Your code compiles find if the second one is u…

To put it simply, the scope of use is the enclosing curly brackets. In technical terms, it's either a module or a block. So in your case, use rayon::iter::ParallelIterator is effective only inside the get_file_list function, but for its whole body. Reference.

Thanks, So two follow-up questions: Why doesn't the same rule apply to other 'use' ? Why do I need 'use rayon...' in both places: top of the file and method? Thank you.

Sorry, that was really silly of me. Thanks a lot.

Scope for "use"?

lwojtow December 21, 2019, 10:27am 3

Thanks,
So two follow-up questions:

Why doesn't the same rule apply to other 'use' ?
Why do I need 'use rayon...' in both places: top of the file and method?

Thank you.

Topic		Replies	Views
[solved] Iterating a normal iterator with rayon help	1	1054	November 12, 2017
Use statements inside functions help	8	3591	June 24, 2020
Dynamically using (or not using) rayon help	10	3708	February 22, 2019
Scoping rules for modules	1	882	May 26, 2016
Why doesn't rayon need arc	1	671	October 1, 2023

Scope for "use"?

Related topics