factory.h:3:  public: should be indented +1 space inside class Object  [whitespace/indent] [3]
factory.h:8:  public: should be indented +1 space inside class Child  [whitespace/indent] [3]
factory.h:9:  Tab found; better to use spaces  [whitespace/tab] [1]
factory.h:9:  Single-parameter constructors should be marked explicit.  [runtime/explicit] [5]
factory.h:10:  Tab found; better to use spaces  [whitespace/tab] [1]
factory.h:11:  Tab found; better to use spaces  [whitespace/tab] [1]
factory.h:12:  Tab found; better to use spaces  [whitespace/tab] [1]
factory.h:13:  private: should be indented +1 space inside class Child  [whitespace/indent] [3]
factory.h:14:  Tab found; better to use spaces  [whitespace/tab] [1]
factory.h:21:  Missing space before {  [whitespace/braces] [5]
factory.h:23:  Add #include <string> for string  [build/include_what_you_use] [4]
Done processing factory.h
Total errors found: 11