prime_gen.h:4:  private: should be indented +1 space inside class PrimeNumberGenerator  [whitespace/indent] [3]
prime_gen.h:6:  public: should be indented +1 space inside class PrimeNumberGenerator  [whitespace/indent] [3]
prime_gen.h:7:  Missing space before {  [whitespace/braces] [5]
prime_gen.h:9:  { should almost always be at the end of the previous line  [whitespace/braces] [4]
prime_gen.h:14:  If/else bodies with multiple statements require braces  [readability/braces] [4]
prime_gen.h:15:  If/else bodies with multiple statements require braces  [readability/braces] [4]
prime_gen.h:11:  Add #include <vector> for vector<>  [build/include_what_you_use] [4]
prime_gen.h:23:  Could not find a newline character at the end of the file.  [whitespace/ending_newline] [5]
Done processing prime_gen.h
Total errors found: 8