An (In-) Complete Guide to C++ Object Lifetimes
summary
Deep dive into when lifetimes actually start and end: exact rules for temporaries and temporary lifetime extension, placement new plus explicit destruction and std::destroy_at, when malloc/mmap/operator new create no objects and how implicit object creation or manual std::start_lifetime_as fixes that, provenance and strict‑aliasing impacts on optimizations, when std::launder or std::bit_cast are required, union common initial sequence, and which patterns compilers accept or optimize away.
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chapters (10)
- 0:00Welcome
- 6:30Object fundamentals
- 11:48Storage duration basics
- 18:50Temporary objects
- 29:20Placement new
- 36:58Implicit object creation
- 44:05Provenance rules
- 51:54Type punning
- 54:02Dangling references
- 59:19Q&A
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