PK_convexity_t   


typedef int PK_convexity_t;


This field can take any one of the following values.
    PK_convexity_unset_c     : convexity not known
    PK_convexity_arbitrary_c : any convexity
    PK_convexity_convex_c    : convex
    PK_convexity_concave_c   : concave