Not understanding someone in Programming Rust 2nd Edition | Rust Programming Language Community | Page 1

restive chasm Oct 23, 2022, 5:28 AM

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I am not understanding the difference between:

"We say that the variable’s lifetime must contain or enclose that of the reference borrowed from it."

And:

"We say that the reference’s lifetime must contain or enclose the variable’s."

Any help would be appreciated.

rain turret Oct 23, 2022, 5:31 AM

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Contain here means outlive. The variable must be alive before the reference is made and stay alive past when the reference is dropped.

restive chasm Oct 23, 2022, 5:32 AM

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Ok then what is the difference between the two quotes would you say

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this is the diagram he gave

rain turret Oct 23, 2022, 5:32 AM

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This code will not compile.

restive chasm Oct 23, 2022, 5:32 AM

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it's probably not that ocmplex but it's not registering 4 me

rain turret Oct 23, 2022, 5:34 AM

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I'd say this: &x is given the name r. r is created after x so that's fine, but it needs to be dropped before x is dropped, which it isn't.

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"the variable" here is x

#Not understanding someone in Programming Rust 2nd Edition