In file included from main.cpp:17:0:
figure.h:57:1: error: 'str' does not name a type
 str::shared_ptr<Rect> CreateFigure(std::istringstream& is) {
 ^~~
main.cpp: In function 'int main()':
main.cpp:33:22: error: 'CreateFigure' was not declared in this scope
    figures.push_back(CreateFigure(is));
                      ^~~~~~~~~~~~
main.cpp:33:22: note: suggested alternative: '_ZTI6Figure'
    figures.push_back(CreateFigure(is));
                      ^~~~~~~~~~~~
                      _ZTI6Figure