davmf f7520ad0bd Topic/optional monadic operations (#1501) ... * Topic/optional monadic operations * topic/optional-monadic-operations: - added and_then, or_else, and transform to etl::optional with unit tests - added is_optional to optional.h, used in and_then and or_else to ensure that the returned type is an optional - implemented as ref-qualified overloads with C++11 compatible trailing return types, following the etl::expected implementation * Convert to C++11 style type traits * Coderabbit changes Constrain transform before forming etl::optional<U>. Remove references from monadic result types. * clang-format updates --------- Co-authored-by: John Wellbelove <john.wellbelove@etlcpp.com> Co-authored-by: John Wellbelove <jwellbelove@users.noreply.github.com>		2026-08-25 09:29:01 +01:00
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etl	Topic/optional monadic operations (#1501)	2026-08-25 09:29:01 +01:00