format_visitor.h:1:  Line ends in whitespace.  Consider deleting these extra spaces.  [whitespace/end_of_line] [4]
format_visitor.h:3:  Should have a space between // and comment  [whitespace/comments] [4]
format_visitor.h:4:  Should have a space between // and comment  [whitespace/comments] [4]
format_visitor.h:5:  Should have a space between // and comment  [whitespace/comments] [4]
format_visitor.h:6:  Should have a space between // and comment  [whitespace/comments] [4]
format_visitor.h:20:  If/else bodies with multiple statements require braces  [readability/braces] [4]
format_visitor.h:29:  If/else bodies with multiple statements require braces  [readability/braces] [4]
Done processing format_visitor.h
Total errors found: 7