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This function returns the number of items currently in a table.

9. <Table count function prototype 9> =
size_t tbl_count (const struct tbl_table *);

The actual tables instead use a macro for implementation.


1. Implement tbl_count() as a macro, on the assumption that struct tbl_table keeps the number of items in the table in a size_t member named tbl_count. [answer]