Roland Reichwein af3944acdb Fix iterator_traits: make SFINAE-friendly for iterators without nested typedefs (#1447) ... The primary etl::iterator_traits template previously required all five nested typedefs (iterator_category, value_type, difference_type, pointer, reference) to exist, causing hard compilation errors with iterators like std::common_iterator or ranges::common_iterator. Changes: 1. Make primary template SFINAE-friendly: split into an empty primary template and a void_t-guarded partial specialization that only activates when all nested typedefs are present. 2. Add explicit std::common_iterator specialization (C++20/STL): a partial specialization that delegates to std::iterator_traits<std::common_iterator<I,S>>. 3. Fall through to std::iterator_traits: the empty primary template inherits from std::iterator_traits<TIterator> when building with STL and C++20, so any iterator with a std::iterator_traits specialization works automatically. 4. Remove iterator_traits dependency from etl::vector: assign() now uses decltype(*first) for the type-compatibility static assert, and insert() uses ptrdiff_t directly instead of querying iterator_traits<TIterator>::difference_type.		2026-05-26 09:11:24 +01:00
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etl	Fix iterator_traits: make SFINAE-friendly for iterators without nested typedefs (#1447)	2026-05-26 09:11:24 +01:00