prime_gen.h:6:  public: should be indented +1 space inside class PrimeNumberGenerator  [whitespace/indent] [3]
prime_gen.h:7:  Do not leave a blank line after "public:"  [whitespace/blank_line] [3]
prime_gen.h:8:  You don't need a ; after a }  [readability/braces] [4]
prime_gen.h:36:  You don't need a ; after a }  [readability/braces] [4]
prime_gen.h:31:  Missing space before ( in if(  [whitespace/parens] [5]
prime_gen.h:37:  private: should be indented +1 space inside class PrimeNumberGenerator  [whitespace/indent] [3]
prime_gen.h:37:  "private:" should be preceded by a blank line  [whitespace/blank_line] [3]
prime_gen.h:12:  Add #include <vector> for vector<>  [build/include_what_you_use] [4]
Done processing prime_gen.h
Total errors found: 8