In file included from main.cpp:17:0:
figure.h:6:18: error: comma-separated list in using-declaration only available with -std=c++1z or -std=gnu++1z [-Werror]
 using std::string, std::shared_ptr, std::istringstream;
                  ^
figure.h:6:35: error: comma-separated list in using-declaration only available with -std=c++1z or -std=gnu++1z [-Werror]
 using std::string, std::shared_ptr, std::istringstream;
                                   ^
figure.h: In function 'std::shared_ptr<Figure> CreateFigure(std::istringstream&)':
figure.h:81:1: error: control reaches end of non-void function [-Werror=return-type]
 }
 ^
cc1plus: all warnings being treated as errors