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Diffstat (limited to 'docs/checks/README-qstring-left.md')
| -rw-r--r-- | docs/checks/README-qstring-left.md | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/docs/checks/README-qstring-left.md b/docs/checks/README-qstring-left.md new file mode 100644 index 00000000..b4b53a98 --- /dev/null +++ b/docs/checks/README-qstring-left.md @@ -0,0 +1,9 @@ +# qstring-left + +Finds places where you're using `QString::left(1)` instead of `QString::at(0)`. +The later form is cheaper, as it doesn't deep-copy the string. + +There's however another difference between the two: `left(1)` will return an empty +string if the string is empty, while `QString::at(0)` will assert. So be sure +that the string can't be empty, or add a `if (!str.isEmpty()` guard, which is still +faster than calling `left()` for the cases which deep-copy. |