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README-old-style-connect.md

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old-style-connect

Finds usages of old style connects. Connecting with old style syntax (SIGNAL/SLOT) is much slower than using pointer to member syntax (PMF).

Here's however a non-exhaustive list of caveats you should be aware of:

  • You can't disconnect with new-syntax if the connect was made with old-syntax (and vice-versa)
  • You can't disconnect from a static slot with new-syntax (although connecting works)
  • Difference in behaviour when calling slots of partially destroyed objects (https://codereview.qt-project.org/#/c/83800)

Fixits

You can convert the most simple cases with export CLAZY_FIXIT=fix-old-style-connect. Be careful, as PMF is not a 100% drop-in replacement.

Pitfalls

Although this check doesn't have false-positives it's a level2 check, that's because some connects are tricky to convert to PMF syntax and might introduce bugs if you don't know what you're doing.