Many of the DBTools structures use bit fields to hold Boolean information in a compact manner. For example, the backup structure includes the following bit fields:

a_bit_field     backup_database : 1;
a_bit_field     backup_logfile  : 1;
a_bit_field     no_confirm  : 1;
a_bit_field     quiet       : 1;
a_bit_field     rename_log  : 1;
a_bit_field     truncate_log : 1;
a_bit_field     rename_local_log: 1;
a_bit_field     server_backup   : 1;

Each bit field is one bit long, indicated by the 1 to the right of the colon in the structure declaration. The specific data type used depends on the value assigned to a_bit_field, which is set at the top of dbtools.h, and is operating system-dependent.

You assign a value of 0 or 1 to a bit field to pass Boolean information in the structure.