In file included from main.cpp:17:0:
figure.h: In function 'std::shared_ptr<Figure> CreateFigure(std::istringstream&)':
figure.h:61:11: error: 'ws' was not declared in this scope
     is >> ws;
           ^~
figure.h:61:11: note: suggested alternative:
In file included from /usr/include/c++/7/istream:991:0,
                 from /usr/include/c++/7/iostream:40,
                 from main.cpp:1:
/usr/include/c++/7/bits/istream.tcc:1024:5: note:   'std::ws'
     ws(basic_istream<_CharT, _Traits>& __in)
     ^~