Here is a list of all documented typedefs with links to the struct/union documentation for each field:

• difference_type : U_HEADER_ONLY_NAMESPACE::prv::CodePointsIterator< CP32, skipSurrogates >, U_HEADER_ONLY_NAMESPACE::UnsafeUTFIterator< CP32, UnitIter, typename >, U_HEADER_ONLY_NAMESPACE::UTFIterator< CP32, behavior, UnitIter, LimitIter, typename >
• Factory : icu::Transliterator
• iterator_category : U_HEADER_ONLY_NAMESPACE::prv::CodePointsIterator< CP32, skipSurrogates >, U_HEADER_ONLY_NAMESPACE::UnsafeUTFIterator< CP32, UnitIter, typename >, U_HEADER_ONLY_NAMESPACE::UTFIterator< CP32, behavior, UnitIter, LimitIter, typename >
• pointer : U_HEADER_ONLY_NAMESPACE::prv::CodePointsIterator< CP32, skipSurrogates >, U_HEADER_ONLY_NAMESPACE::UnsafeUTFIterator< CP32, UnitIter, typename >, U_HEADER_ONLY_NAMESPACE::UTFIterator< CP32, behavior, UnitIter, LimitIter, typename >
• reference : U_HEADER_ONLY_NAMESPACE::prv::CodePointsIterator< CP32, skipSurrogates >, U_HEADER_ONLY_NAMESPACE::UnsafeUTFIterator< CP32, UnitIter, typename >, U_HEADER_ONLY_NAMESPACE::UTFIterator< CP32, behavior, UnitIter, LimitIter, typename >
• type : icu::prv::value_type_or_char< StringClass, typename >, icu::prv::value_type_or_char< StringClass, std::void_t< typename StringClass::value_type > >
• UMFErrorHandlingBehavior : icu::message2::MessageFormatter
• value_type : icu::UnicodeString, U_HEADER_ONLY_NAMESPACE::prv::CodePointsIterator< CP32, skipSurrogates >, U_HEADER_ONLY_NAMESPACE::UnsafeUTFIterator< CP32, UnitIter, typename >, U_HEADER_ONLY_NAMESPACE::UTFIterator< CP32, behavior, UnitIter, LimitIter, typename >