29 lines
886 B
Plaintext
29 lines
886 B
Plaintext
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== Why is this an issue?
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Using ``++MaybeUninit::uninit().assume_init()++`` results in undefined behavior for most types, since it bypasses initialization and assumes the data is valid. This can lead to unpredictable results and hard-to-diagnose bugs.
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=== Code examples
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==== Noncompliant code example
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[source,rust,diff-id=1,diff-type=noncompliant]
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----
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use std::mem::MaybeUninit;
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let _: usize = unsafe { MaybeUninit::uninit().assume_init() }; // Noncompliant: Unsafe code resulting in undefined behavior.
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----
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==== Compliant solution
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[source,rust,diff-id=1,diff-type=compliant]
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----
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use std::mem::MaybeUninit;
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let _: [MaybeUninit<bool>; 5] = unsafe { MaybeUninit::uninit().assume_init() }; // Compliant: Allowed for tuples/arrays of MaybeUninit.
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----
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== Resources
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=== Documentation
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* Clippy Lints - https://rust-lang.github.io/rust-clippy/master/index.html#uninit_assumed_init
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