00d540f5ed
* Create rule S7437 * Update rule.adoc * Update metadata.json * Update metadata.json * Update metadata.json * Update metadata.json * Update metadata.json --------- Co-authored-by: sallaigy <sallaigy@users.noreply.github.com> Co-authored-by: Gyula Sallai <gyula.sallai@sonarsource.com>
30 lines
765 B
Plaintext
30 lines
765 B
Plaintext
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== Why is this an issue?
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The sequence `foo = bar; bar = foo` looks like a failed attempt to swap the values of two variables. This code mistakenly reassigns both variables, leading to incorrect and unintended behavior. Using `std::mem::swap` ensures a correct and intended swap.
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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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let mut foo = 1;
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let mut bar = 2;
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foo = bar; // Noncompliant
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bar = foo; // Noncompliant
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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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let mut foo = 1;
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let mut bar = 2;
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std::mem::swap(&mut foo, &mut bar); // Compliant
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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#almost_swapped
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