| Variables | Description |
| long long int left_bound, right_bound
low_bound, high_bound |
Left, right, low respectively high value of the physical type. Corresponds to the appropriate VHDL attributes. |
| const char **units | An array of char pointer which store the various unit strings of the type. The string for the basic unit is stored at index 0. |
| const long long int *scale | This array stores the number of basic units each unit consists of. Note, ``scale[0]'' is always equal to 1. |
| int unit_count | Number of units. |