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Diffstat (limited to 'src/checks/level1/README-connect-3arg-lambda.md')
| -rw-r--r-- | src/checks/level1/README-connect-3arg-lambda.md | 21 |
1 files changed, 0 insertions, 21 deletions
diff --git a/src/checks/level1/README-connect-3arg-lambda.md b/src/checks/level1/README-connect-3arg-lambda.md deleted file mode 100644 index 1ec7c146..00000000 --- a/src/checks/level1/README-connect-3arg-lambda.md +++ /dev/null @@ -1,21 +0,0 @@ -# connect-3arg-lambda - -Warns when using the 3-arg `QObject::connect` that takes a lambda. -The recommendation is to use the 4-arg overload, which takes a context object -so that the lambda isn't executed when the context object is deleted. - -It's very common to use lambdas to connect signals to slots with different number -of arguments. This can result in a crash if the signal is emitted after the receiver -is deleted. - -Another reason for using a context-object is so you explicitly think about in -which thread you want the slot to run in. Note that with a context-object the -connection will be of type `Qt::AutoConnection` instead of `Qt::DirectConnection`, -which you can control if needed, via the 5th (optional) argument. - - -In order to reduce false-positives, it will only warn if the lambda body dereferences -at least one QObject (other than the sender). - -It's very hard to not have any false-positives. If you find any you probably can just -pass the sender again, as 3rd parameter. |