Back to Basics: Class Layout
summary
Explains how compilers actually lay out C++ objects: field offsets, padding, vptr/vtable entries and thunks, and how those choices break memcmp-based comparisons and void hacks; demonstrates ARM assembly output (via Compiler Explorer) and concrete hardware mappings (memory‑mapped UART/timer) with static checks like static_assert and offsetof; shows C++20 fixes such as no unique address* and new type_traits, quantifies surprises (padding bytes can flip equality after unrelated calls) and explains thunk vs delta table implementations.
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chapters (5)
- 0:00Start
- 4:37Non-Static Data Member Layout
- 36:41Virtual Calling Sequence
- 41:00Implementation of Multiple Inheritance
- 59:15Use Interface Classes
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