(in libkernel) the module to return a unidic positive int for each string
the class to hold key-index pairs, keys are strings, indices are unique ints
| final :: clean_dic | clean the object to avoid memory leak |
| procedure, public :: num | the number of items in a unidic |
| procedure, public :: add | add a key to a unidic, return its index |
| procedure, public :: del | delete a key in a unidic, return its index |
| procedure, public :: val | find a key in a unidic, return its index |
| procedure, public :: show | show a unidic |
| procedure, public :: rename | rename a key in a unidic |
| procedure, public :: clean | clean a unidic |
| procedure, public :: print | print a unidic to a file |
| procedure, public :: read | read a unidic from a file |
| procedure, public :: iterate | iterate a unidic. Use it in this way: do while(U%iterate(key,val)) |
| generic, public :: assignment(=) => copy | assignment of a unidic |