11.1 The Multiset struct

A multiset is defined by a structure containing three components, the values of n and k, and a pointer to the multiset array. The elements of the multiset array are all of type size_t, and are stored in increasing order. The gsl_multiset structure looks like this,

typedef struct
{
  size_t n;
  size_t k;
  size_t *data;
} gsl_multiset;