Learning rust and from what I’ve learned so far I can guess why people wanna oxidize everything: Memory is based on ownership. You try to copy a variable from another, the original gone unless you tell it otherwise Everything will return a value whether you want to or not :v - ThreadSky

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duetsneplynx.bsky.social • 3 days ago

Learning rust and from what I’ve learned so far I can guess why people wanna oxidize everything:

Memory is based on ownership. You try to copy a variable from another, the original gone unless you tell it otherwise
Everything will return a value whether you want to or not :v

Comments

duetsneplynx.bsky.social•3 days ago

Getting used to that I bet it feels weird to use C/C++

pumamancer.bsky.social•3 days ago

not a rust programmer! started on c/c++ and eventually grew to c#/java

but i have to ask, how is that different from passing by reference? or does attempting to access the original variable throw exceptions?

hjvt.dev•3 days ago

It doesn't throw anything, because it doesn't even compile.

duetsneplynx.bsky.social•3 days ago

actually accessing variable values is all referencing rather than passing. It’s what’s recommended. I also started with C. It has a lot of close paralells to it but acts really different.

vascocosta.bsky.social•3 days ago

The OP is talking about something different, which is unique to Rust, known as ownership rules or move semantics. Attempting to access the original variable is a compile time error. It's not even a valid program. I made a simple snippet illustrating it here:

https://play.rust-lang.org/?version=stable&mode=debug&edition=2024&gist=bb2c2d38f549537d103dbf38ccbebba2

vascocosta.bsky.social•3 days ago

This happens with owned values (not a reference), which cannot be copied. Usually values stored on the heap like String, rather than stack values like primitive types (which are cheap to copy). This apparently odd behaviour is what allows Rust to manage memory without a GC.

vascocosta.bsky.social•3 days ago

The OP used the word copied, but a better word is moved. Anyway, these are all subtleties of Rust which probably would only click if you read about the ownership rules and the borrow checker.

If you manage to go through the example I linked, you can make it compile by commenting out the last line.

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