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style-guide: Narrow guidance about references and dereferencing #113143

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Jun 29, 2023
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style-guide: Narrow guidance about references and dereferencing #113143

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3 changes: 2 additions & 1 deletion src/doc/style-guide/src/expressions.md
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Expand Up @@ -288,7 +288,8 @@ and other assignment operators such as `+=` or `*=`).

For comparison operators, because for `T op U`, `&T op &U` is also implemented:
if you have `t: &T`, and `u: U`, prefer `*t op u` to `t op &u`. In general,
within expressions, prefer dereferencing to taking references.
within expressions, prefer dereferencing to taking references, unless necessary
(e.g. to avoid an unnecessarily expensive operation).

Use parentheses liberally, do not necessarily elide them due to precedence.
Tools should not automatically insert or remove parentheses. Do not use spaces
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