In file included from main.cpp:17:0:
factory.h: In function 'Object* my_new_smth_()':
factory.h:48:16: error: expected type-specifier before 'Smth'
     return new Smth(class_id);
                ^~~~
factory.h:48:16: error: expected ';' before 'Smth'
factory.h:48:21: error: 'class_id' was not declared in this scope
     return new Smth(class_id);
                     ^~~~~~~~
factory.h:48:21: note: suggested alternative: 'class'
     return new Smth(class_id);
                     ^~~~~~~~
                     class
factory.h:48:16: error: 'Smth' was not declared in this scope
     return new Smth(class_id);
                ^~~~
factory.h: In static member function 'static Object* Factory::Create(const string&)':
factory.h:62:28: error: expected type-specifier before 'Smth'
                 return new Smth(class_id);
                            ^~~~
factory.h:62:28: error: expected ';' before 'Smth'
factory.h:62:28: error: 'Smth' was not declared in this scope
main.cpp: In function 'Object* my_new_smth_()':
main.cpp:40:9: error: redefinition of 'Object* my_new_smth_()'
 Object* my_new_smth_() {
         ^~~~~~~~~~~~
In file included from main.cpp:17:0:
factory.h:47:9: note: 'Object* my_new_smth_()' previously defined here
 Object *my_new_smth_() {
         ^~~~~~~~~~~~