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The standard shows this default template argument in the <ranges> synopsis, but it was missing in libstdc++. libstdc++-v3/ChangeLog: * include/std/ranges (basic_istream_view): Add default template argument. * testsuite/std/ranges/istream_view.cc: Check it.
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.