| iterpc-package | Efficient Iterator for Permutations and Combinations | 
| getall | Get all permutations/combinations for a iterator | 
| getcurrent | Get the current element of a iterator | 
| getlength | Get the length for a iterator | 
| getnext | Get the next permutation(s)/combination(s) for a iterator | 
| iterpc | Efficient Iterator for Permutations and Combinations | 
| iter_wrapper | Wrap iterpc objects by iterators::iter | 
| multichoose | Calculate multinomial coefficient | 
| nc_multiset | Calculate the number of r-combinations of a multiset | 
| np_multiset | Calculate the number of r-permutations of a multiset |