Function eosio_cdt_sys::db_previous_i64

pub unsafe extern "C" fn db_previous_i64(
    iterator: i32, 
    primary: *mut u64
) -> i32

Find the table row preceding the referenced table row in a primary 64-bit integer index table

@brief Find the table row preceding the referenced table row in a primary 64-bit integer index table @param iterator - The iterator to the referenced table row @param primary - Pointer to a uint64_t variable which will have its value set to the primary key of the previous table row @return iterator to the table row preceding the referenced table row assuming one exists (it will return -1 if the referenced table row is the first one in the table) @pre iterator points to an existing table row in the table or it is the end iterator of the table @post *primary will be replaced with the primary key of the table row preceding the referenced table row if it exists, otherwise *primary will be left untouched

Example:

@code uint64_t prim = 0; int32_t itr_prev = db_previous_i64(itr, &prim); @endcode