Standard Attributes in C and C++
summary
Survey of C and C++ standard attributes with concrete takeaways: use [[deprecated("...")]] with a message and [[nodiscard]] to catch API misuse; [[maybe_unused]] and [[fallthrough]] silence common warnings. Compiler-hint attributes like [[likely]]/[[unlikely]] rarely help and can pessimize code; [[noreturn]] and [[assume(expr)]] enable optimizations but introduce undefined behavior if wrong. C23 adds reproducible and unsequenced (optimizer hints); no_unique_address changes object layout and is not uniformly supported (MSVC differs).
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chapters (18)
- 0:00Standard attributes in C/C++
- 2:55What standard attributes are
- 17:02Classifying attributes by function
- 18:48Deprecated attribute
- 21:34Maybe unused attribute
- 26:33Fall through attribute
- 30:27No discard attribute
- 41:54No return attribute
- 46:28Carries dependency attribute
- 49:40Likely/unlikely attributes
- 57:45Assume attribute
- 1:07:12No unique address attribute
- 1:11:50C23 standard attributes
- 1:13:13Reproducible/unsequenced attributes
- 1:19:57Ignorability concept
- 1:26:21Ignorability rules
- 1:31:35Optional semantics for attributes
- 1:34:43Future work on attributes
