C++: Be type-safe - The journey of determining the number of elements in an array
summary
Goal is a drop‑in, type‑safe way to get an array element count that fails at compile time. Implementation evolves from a macro to a constexpr function template that takes a const reference to T[N], then to a decltype/std::extent based approach combining std::extent + remove_reference and static_assert for clear errors. Pitfalls shown: sizeof trick misreports pointers, taking an address forces runtime, missing out‑of‑class static defs (C++11 vs C++17), and unit tests reveal edge cases; final options: std::array, span or the robust header-only helper that works across standards.
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chapters (7)
- 0:00Start
- 7:57Type Safety
- 15:29Bonus Slides
- 27:31Error Message
- 35:40Final Solution
- 38:25Resize Helper
- 41:11Counting Array Elements at Compile Time
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