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The infamous C++ garbage collector crash by inexperienced Unreal programmers -- UE C++ Tutorial 4 2 года назад

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The infamous C++ garbage collector crash by inexperienced Unreal programmers -- UE C++ Tutorial 4

Perhaps the most common way someone learning to write C++ in Unreal accidentally crashes the game. Without safe mark up, you can create a ticking time bomb for a crash. C++ can be dangerous if not careful. Blueprint ensures this type of situation isn't possible, but with C++ it is on you to ensure your safely accessing and protecting your memory. By putting the macro UPROPERTY() above your variables to unreal types, the GC becomes aware of the pointer and will manage it. But without it, you create a situation where the GC will free the object, but be unaware to update the pointer to nullptr. Meaning you will have a dangling pointer. At best this null pointer will crash the game. At worst, it will corrupt memory and the game will keep on running with invalid memory. Wrecking incomprehensible and inconsistent issues on the game with undefined behavior. 0:00 Unreal Garbage Collector Explanation 0:34 Easy C++ GC Mistake in Unreal 0:45 Setting up the classes to observe GC Behavior 1:27 Raw Pointer Mistake 2:00 The Solution (Protecting Pointers From GC) 2:24 Adding Comment Explanations 3:56 Creating Objects At Runtime 4:45 Viewing GC Validity State 5:27 Using the pointers 6:26 MarkAsGarbage (force the GC) 7:09 Summarizing Our GC Experiment 7:30 Creating Console Command 8:51 Running the experiment 9:08 Experiment: 1. Creating the unsafe /safe objects 9:35 Experiment: 2. Print Objects (before GC, valid pointers) 9:58 Experiment: 3. Using the pointers (Lucky no crash) 10:12 Experiment: 4. Turn GC on every frame 10:28 Experiment: 5. WARNING -- Dangling pointer! 10:55 Experiment: 6. Force GC on UPROPERTYs (safe) 11:20 Experiment: 7. Comparing unsafe pointers and safe pointer addresses 11:40 Experiment: 8. Safe to nullcheck UProperties demo 11:55 Experiment: 9. the infamous crash, raw pointer appears valid 12:35 Summary 13:57 Actor caveat 14:00 Outro

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