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All classes deriving from nsIFrame that did not have any subclasses themselves (at the time of writing this patch) have been marked with `final`. Some other Layout classes have also been made final, but this was opportunistic while working on nsIFrame subclasses, and is definitely not exhaustive, further patches welcome; refer to bug 1332680. Advantages of marking a class final include: - Allowing the compiler to devirtualize some method calls (i.e., calling virtual functions directly instead of going through the vtable), - Indicating that the class is not currently subclassed, - Preventing subclassing without being aware that this would remove the finalization benefits of the parent class. `final` does not signify that these classes should *never* be subclassed, this is left for developers to decide. Differential Revision: https://phabricator.services.mozilla.com/D5020 --HG-- extra : moz-landing-system : lando |
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| build | ||
| doc | ||
| forms | ||
| generic | ||
| inspector | ||
| ipc | ||
| mathml | ||
| media | ||
| painting | ||
| printing | ||
| reftests | ||
| style | ||
| svg | ||
| tables | ||
| tools | ||
| xul | ||
| moz.build | ||