https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57840
--- Comment #5 from Christopher Yeleighton <giecrilj at stegny dot 2a.pl> --- (In reply to Jonathan Wakely from comment #4) > It shows up in the latest docs: > https://gcc.gnu.org/onlinedocs/libstdc++/libstdc++-api.20210701.html/a03925. > html > > But several other classes don't appear on the type traits page: > https://gcc.gnu.org/onlinedocs/libstdc++/libstdc++-api.20210701.html/a01565. > html > > That seems to be due to > https://github.com/doxygen/doxygen/issues/8638 I am no Doxygen guru but the source at <URL: https://gcc.gnu.org/onlinedocs/libstdc++/libstdc++-api.20210701.html/a00209_source.html > has 2 @{ (#l00051, #l00237) but only 1 @} (#l00266).