“Variadic expansion in examples"
summary
Covers practical parameter-pack expansion use cases and pitfalls and shows real code: uses std::integer_sequence to unpack tuples into calls, uses empty packs / enable_if idioms to hide overloads, and demonstrates the braced-init-list trick to force left-to-right evaluation so per-argument expressions run safely. Builds an in-line variant visitor by expanding a pack of lambdas into a call table (with a GCC workaround) and implements a custom variant using aligned_storage; code mostly works but GCC still requires the workaround while newer compilers emit better static init code.
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