René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[MNT]: macOS backend should always pair `+alloc`/`-init` calls","articleBody":"### Summary\n\nI mentioned the following in #21788:\n\n\u003e In Objective-C, an `-init…` method should always be called immediately after `+alloc`. Calling any other instance method on an object you just allocated before calling `-init…` is undefined behavior.[^1][^2][^3]\n\n\u003e I believe that each `tp_new` callback should only call `tp_alloc` and not instantiate an uninitialized Objective-C object. Each `tp_init` callback should then create a fully initialized Objective-C object via an `+alloc`/`-init…` pair.\n\nI'm starting work on #31797 and the use of unpaired `+alloc`/`-init…` calls is generating a few warnings. I'd like to clean this up at the same time I do the ARC work.\n\n[^1]: \"But the resulting object is not yet usable.\" from [Object Allocation](https://developer.apple.com/library/archive/documentation/General/Conceptual/CocoaEncyclopedia/ObjectAllocation/ObjectAllocation.html#//apple_ref/doc/uid/TP40010810-CH7-SW1)\n[^2]: \"You must use an init... method to complete the initialization process.\" from [+alloc](https://developer.apple.com/documentation/objectivec/nsobject-swift.class/alloc)\n[^3]: \"immediately\" and \"An init message is coupled with an alloc … message in the same line of code\" from [-init](https://developer.apple.com/documentation/objectivec/nsobject-swift.class/init()?language=objc)\n\n\n\n### Proposed fix\n\n_No response_","author":{"url":"https://github.com/iccir","@type":"Person","name":"iccir"},"datePublished":"2026-05-31T18:15:24.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/31798/matplotlib/issues/31798"}