set.h:6:  public: should be indented +1 space inside class Set  [whitespace/indent] [3]
set.h:10:  You don't need a ; after a }  [readability/braces] [4]
set.h:9:  Single-parameter constructors should be marked explicit.  [runtime/explicit] [5]
set.h:25:  Missing space around colon in range-based for loop  [whitespace/forcolon] [2]
set.h:35:  Missing space around colon in range-based for loop  [whitespace/forcolon] [2]
set.h:46:  Missing space around colon in range-based for loop  [whitespace/forcolon] [2]
set.h:56:  Missing space around colon in range-based for loop  [whitespace/forcolon] [2]
set.h:78:  private: should be indented +1 space inside class Set  [whitespace/indent] [3]
Done processing set.h
Total errors found: 8