format_visitor.h:30:  Missing space around colon in range-based for loop  [whitespace/forcolon] [2]
format_visitor.h:46:  Missing space around colon in range-based for loop  [whitespace/forcolon] [2]
format_visitor.h:84:  You don't need a ; after a }  [readability/braces] [4]
format_visitor.h:85:  private: should be indented +1 space inside class FormatVisitor  [whitespace/indent] [3]
format_visitor.h:85:  "private:" should be preceded by a blank line  [whitespace/blank_line] [3]
format_visitor.h:87:  Add #include <string> for string  [build/include_what_you_use] [4]
format_visitor.h:87:  Add #include <vector> for vector<>  [build/include_what_you_use] [4]
Done processing format_visitor.h
Total errors found: 7