set.h:13:  public: should be indented +1 space inside class Set  [whitespace/indent] [3]
set.h:15:  Single-parameter constructors should be marked explicit.  [runtime/explicit] [5]
set.h:43:  Line ends in whitespace.  Consider deleting these extra spaces.  [whitespace/end_of_line] [4]
set.h:51:  Missing space around colon in range-based for loop  [whitespace/forcolon] [2]
set.h:59:  Missing space around colon in range-based for loop  [whitespace/forcolon] [2]
set.h:67:  Missing space around colon in range-based for loop  [whitespace/forcolon] [2]
set.h:70:  Missing space around colon in range-based for loop  [whitespace/forcolon] [2]
set.h:77:  private: should be indented +1 space inside class Set  [whitespace/indent] [3]
set.h:85:  Lines should be <= 80 characters long  [whitespace/line_length] [2]
Done processing set.h
Total errors found: 9