prime_gen.h:2:  public: should be indented +1 space inside class PrimeNumberGenerator  [whitespace/indent] [3]
prime_gen.h:30:  You don't need a ; after a }  [readability/braces] [4]
prime_gen.h:13:  Weird number of spaces at line-start.  Are you using a 2-space indent?  [whitespace/indent] [3]
prime_gen.h:18:  If statement had no body and no else clause  [whitespace/empty_if_body] [4]
prime_gen.h:21:  Weird number of spaces at line-start.  Are you using a 2-space indent?  [whitespace/indent] [3]
prime_gen.h:1:  Failed to find complete declaration of class PrimeNumberGenerator  [build/class] [5]
Done processing prime_gen.h
Total errors found: 6