usr/include/c++/10/concepts:67:28: note: РІР‚Вstd::bidirectional_iterator_tagРІР‚в„ў is not a base of РІР‚Вstd::forward_iterator_tagРІР‚в„ўР”В¦7 | concept derived_from = _is_base_of(_Base, _Derived)Р”В«asically, there is a data() member on the iterator - but that member function has a constraint on the iterator being a contiguous iterator, and the iterator in question is not a contiguous iterator because itРІР‚в„ўs only a forward iterator. usr/include/c++/10/bits/iterator_concepts.h:578:13: required for the satisfaction of РІР‚Вbidirectional_iteratorРІР‚в„ў [with _Iter = std::ranges::split_viewРІР‚в„ў [with _Iter = std::ranges::split_view()))>РІР‚в„ў [with _Container = std::ranges::spl usr/include/c++/10/concepts:67:13: required for the satisfaction of РІР‚Вderived_from::type, std::bidirectional_iterator_tag>РІР‚в„ў [with _Iter = std::ranges::split_v usr/include/c++/10/ranges:1171:44: required from РІР‚Вconstexpr auto std::ranges::views::_adaptor::operator|(_Range&, const std::ranges::views::_adaptor::_RangeAdaptorClosure&) [with _Range = std::r usr/include/c++/10/ranges:1978:73: required from РІР‚Вstd::ranges::views:: [with _Range = std::ranges::split_view >, std::rang usr/include/c++/10/type_traits:3006:73: required from РІР‚Вconstexpr const bool std::is_invocable_v&, std::ranges::split_view std::ranges::transform_view(_Range&, _Fp)-> std::ranges::transform_view, _ usr/include/c++/10/type_traits:2961:12: required from РІР‚Вstruct std::is_invocable&, std::ranges::split_view >, usr/include/c++/10/type_traits:2517:55: required from РІР‚Вstruct std::_result_of_impl&, std::ranges::split_view struct std::_is_invocable_impl > [ usr/include/c++/10/type_traits:2506:26: required by substitution of РІР‚Вtemplate static std::_result_of_success()((declval)().)), std::_invoke_other> Split.cxx:10:28: required from РІР‚Вints(const string&):: [with auto:13 = std::ranges::split_view >, std::ranges::single_view >:: usr/include/c++/10/concepts: In instantiation of РІР‚Вconstexpr auto std::ranges::view_interface::data() requires contiguous_iterator)()))> [w In file included from /usr/include/c++/10/ranges:37, | ^~~~ /usr/include/c++/10/ranges:134:7: note: constraints not satisfied usr/include/c++/10/ranges:134:7: note: candidate: РІР‚Вconstexpr auto std::ranges::view_interface::data() requires contiguous_iterator)()))> [Р”РЋ34 | data() requires contiguous_iterator> The reason for the lack of data() is also spelled out: In file included from split.cxx:2: You might then think that oh, weРІР‚в„ўre not suppose to pass iterators, we have to pass v.data() and v.data() + v.size() : split.cxx:10:28: error: no matching function for call to РІР‚Вstd::ranges::split_view >, std::ranges::single_view >::_OuterIter::value_type::data()РІР‚в„ўР”РЋ0 | from_chars( v.data(), v.data() + v.size(), &i) Split.cxx:10:29: note: cannot convert РІР‚Вv.std::ranges::split_view >, std::ranges::single_view >::_OuterIter::value_type::begin()РІР‚в„ў (type РІР‚Вstd::ranges::split_view >, std::ranges::single_view >::_InnerIterРІР‚в„ў) to type РІР‚Вconst char*РІР‚в„ўР”РЋ0 | from_chars( v.begin(), v.end(), &i)

| ^~~~~~~~~~ /usr/include/c++/10/charconv:588:5: note: template argument deduction/substitution failed: usr/include/c++/10/charconv:588:5: note: candidate: РІР‚В template std::_detail::_integer_from_chars_result_type std::from_chars(const char*, const char*, _Tp&, int)РІР‚в„ўР”Тђ88 | from_chars(const char* _first, const char* _last, _Tp& _value, gcc 10.1 informs us that: split.cxx:10:21: error: no matching function for call to РІР‚Вfrom_chars(std::ranges::split_view >, std::ranges::single_view >::_InnerIter, std::default_sentinel_t, int*)РІР‚в„ў But it turns outРІР‚В¦ we canРІР‚в„ўt use from_chars either. Now, we obviously canРІР‚в„ўt use something like atoi because our pieces arenРІР‚в„ўt going to be null terminated. You might expect to be able to write: std::string s = '1.2.3.4' Р”Р‡or the purposes of this post, IРІР‚в„ўm going to ignore error handling and just assume that we have only integers (as written above, any piece thatРІР‚в„ўs not an integer would end up yielding 0 ). LetРІР‚в„ўs say we want to take a string like '1.2.3.4' and turn it into a range of integers. But thereРІР‚в„ўs a big problem with the specification here which has to do with how the inner range works. This is an incredibly useful adapter since wanting to split things comes up fairly often. There are two kinds of split supported: you can split by a single element or by a range of elements. One of the new additions to C++20 courtesy of Ranges is views::split.

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