class ara::diag::DiagnosticSovdRecordContentElementDataConstIterator

According to [SWS_DM_02264], the class ara::diag::DiagnosticSovdRecordContentElementDataConstIterator acts as a constant forward iterator for read-only traversal of SOVD record content elements. It provides operators for equality checks, advancement, and dereferencing to DiagnosticSovdContentElementDataWithKey ([SWS_DM_02265]). Since all operators are implemented as exception-safe and thread-safe according to noexcept, the responsibility lies with the caller not to dereference invalid iterators.

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Context

The class ara::diag::DiagnosticSovdRecordContentElementDataConstIterator is defined by [SWS_DM_02264] in AUTOSAR_AP_SWS_Diagnostics §8.60.8. It serves as a constant forward or input iterator for elements of type DiagnosticSovdRecordContentElementData, as described in AUTOSAR_AP_SWS_Diagnostics §8.60.8. The interaction partners here are diagnostic applications of module diag, which traverse collections of SOVD data elements (\"Service-Oriented Vehicle Diagnostics\") in a read-only manner, as well as the referenced elements of type DiagnosticSovdContentElementDataWithKey to which the iterator grants access during dereferencing ([SWS_DM_02265], [SWS_DM_02266]).

Lifecycle

The lifecycle of an iterator typically begins with retrieving an iterator instance via the interface of an underlying data structure for SOVD record elements (interpretation: containers likely possess methods such as cbegin() and cend() that provide valid iterator instances). Question Q-9c5e4d32ae82e7cf (open) Since it is a pure value or pointer wrapper without dynamic resource management, the iterator has no explicit destruction mechanism and can be copied or moved. The specification guarantees exception safety (exception safe) and full thread safety (thread-safe) for all operations of the iterator ([SWS_DM_02265], [SWS_DM_02266], [SWS_DM_02267], [SWS_DM_02268], [SWS_DM_02269]). With respect to concurrency, this means that parallel read accesses to the same iterator or independent instances can be performed without additional synchronization measures.

Usage Path

The typical usage path comprises the iterative traversal of a set of SOVD element data within diagnostic processing routines. A caller first checks via the inequality operator operator!= ([SWS_DM_02268]) or the equality operator operator== ([SWS_DM_02267]) whether the end of the sequence has been reached. As long as the iterator is valid, the application accesses the referenced element in a read-only manner: The dereference operator operator* returns a constant reference to DiagnosticSovdContentElementDataWithKey ([SWS_DM_02265]), while the arrow operator operator-> returns a pointer to the constant object ([SWS_DM_02266]). Subsequently, the prefix increment operator operator++ advances the iterator by one position and returns a reference to the incremented iterator ([SWS_DM_02269]).

Sequence diagram: Typical sequence of sequential traversal of SOVD record content elements using the const iterator. Sources: [SWS_DM_02265], [SWS_DM_02266], [SWS_DM_02267], [SWS_DM_02268], [SWS_DM_02269]

Error Scenarios

All member functions of ara::diag::DiagnosticSovdRecordContentElementDataConstIterator are declared with the specifier noexcept ([SWS_DM_02265], [SWS_DM_02266], [SWS_DM_02267], [SWS_DM_02268], [SWS_DM_02269]). Neither operator* nor operator-> nor the comparison operators throw C++ exceptions or return ara::core::Result error structures. The precondition for an error-free invocation of operator*, operator->, and operator++ is the validity of the iterator: Dereferencing or advancing an end iterator (past-the-end) is likely to lead to undefined behavior (interpretation: the interface definition does not contain runtime checks for invalid dereferences). Question Q-e26c9aa50597bf18 (open) Users must therefore ensure that an abort comparison against the end iterator always takes place prior to access.