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Fix SL.io.50: Avoid endl. #2323

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Fix SL.io.50: Avoid endl. #2323

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3 changes: 2 additions & 1 deletion CppCoreGuidelines.md
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Expand Up @@ -20446,7 +20446,7 @@ This slowdown can be significant compared to `printf`-style output.

##### Note

For `cin`/`cout` (and equivalent) interaction, there is no reason to flush; that's done automatically.
For `cin`/`cout` (and equivalent) interaction, there is usually no reason to flush; that's typically done automatically.
For writing to a file, there is rarely a need to `flush`.

##### Note
Expand All @@ -20460,6 +20460,7 @@ Windows). So for a string stream, `s << endl` just inserts a *single* character,
##### Note

Apart from the (occasionally important) issue of performance,
and the rare cases where it is important to flush manually,
the choice between `'\n'` and `endl` is almost completely aesthetic.

## <a name="ss-regex"></a>SL.regex: Regex
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