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The bug report is that transform_view's sentinel<false> cannot be compared to its iterator<true>. The comparison is supposed to use operator==(iterator<Const>, sentinel<Const>) after converting sentinel<false> to sentinel<true>. However, the operator== is a hidden friend so is not a candidate when comparing iterator<true> with sentinel<false>. The required conversion would only happen if we'd found the operator, but we can't find the operator until after the conversion happens. A new LWG issue has been reported, but not yet assigned a number. The solution suggested by Casey Carter is to make the hidden friends of the sentinel types work with iterators of any const-ness, so that no conversions are required. Patrick Palka observed that join_view has a similar problem and a similar fix is used for its sentinel. PR libstdc++/95322 * include/std/ranges (transform_view::_Sentinel): Allow hidden friends to work with _Iterator<true> and _Iterator<false>. (join_view::_Sentinel): Likewise. * testsuite/std/ranges/adaptors/95322.cc: New test. |
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| config | ||
| doc | ||
| include | ||
| libsupc++ | ||
| po | ||
| python | ||
| scripts | ||
| src | ||
| testsuite | ||
| acinclude.m4 | ||
| aclocal.m4 | ||
| ChangeLog | ||
| ChangeLog-1998 | ||
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| ChangeLog-2017 | ||
| ChangeLog-2018 | ||
| ChangeLog-2019 | ||
| config.h.in | ||
| configure | ||
| configure.ac | ||
| configure.host | ||
| crossconfig.m4 | ||
| fragment.am | ||
| linkage.m4 | ||
| Makefile.am | ||
| Makefile.in | ||
| README | ||
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.