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Mojo🔥: a deep dive on ownership with Chris Lattner

Learn everything you need to know about ownership in Mojo, a deep dive with Modular CEO Chris Lattner If you have any questions make sure to join our friendly discord community: https://modul.ar/discord If you're ready to get started with Mojo, check out the programming manual and installation guide: https://modul.ar/mojo-get-started 0:00 Mojo🔥: a deep dive on ownership with Chris Lattner 00:00 Introduction 00:55 Define Terms 01:11 Garbage Collectors 01:23 Copies 01:39 Goal of ownership model 02:15 Learning from Rust 03:26 How the compiler works 04:18 Type Checker 06:13 Context Insensitive Type Checker 07:20 No traditional AST 08:07 Ownership 08:20 RValue: an owned value 10:35 LValues: assignable and mutable 14:04 BValues: Borrowed Values 16:10 Ownership conversions 16:38 BValue Conversions 17:25 RValue Conversions 18:58 LValue Conversions 20:42 Examples of RValues 21:10 Memory and SSA Types 21:59 Ownership Transfer with ^ 22:56 std::move from C++ 24:39 Marking variables as uninitialized after transfer with ^ 27:51 Data flow checker with argument conventions 31:49 Destructor Insertion 34:40 ASAP Destruction 37:19 Avoiding allocations optimization 38:00 Copy to move optimizations 40:13 @value decorator 41:00 Where does destructor run on borrowed argument 41:46 Copy to move optimization clarification 42:12 Is liveness representable in debug info? 42:27 How ASAP destruction works with loops 42:48 Being simple and optimal 44:14 Allowing more advanced use cases and reducing copies 45:04 Field sensitive and composes with member variables 46:27 Dangling pointers 47:51 What safe references will fix