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The _Rg is deduced to lvalue reference for the lvalue arguments, and in such case __format::__maybe_const_range<_Rg, _CharT> is always _Rg (adding const to reference does not change behavior). Now we correctly check if _Range = remove_reference_t<_Rg> is const formattable range, furthermore as range_formatter<T> can only format ranges of values of type (possibly const) _Tp, we additional check if the remove_cvref_t<range_reference_t<const _Range>> is _Tp. The range_reference_t<R> and range_reference_t<const R> have different types (modulo remove_cvref_t) for std::vector<bool> (::reference and bool) or flat_map<T, U> (pair<const T&, U&> and pair<const T&, const U&>). PR libstdc++/109162 libstdc++-v3/ChangeLog: * include/std/format (range_formatter::format): Format const range, only if reference type is not changed. * testsuite/std/format/ranges/formatter.cc: New tests. Reviewed-by: Jonathan Wakely <jwakely@redhat.com> Signed-off-by: Tomasz Kamiński <tkaminsk@redhat.com>
file: libstdc++-v3/README New users may wish to point their web browsers to the file index.html in the 'doc/html' subdirectory. It contains brief building instructions and notes on how to configure the library in interesting ways.