What is the grammatical function of 'enough'?

I'd like to know the grammatical function of 'enough' in this sentence.

There was rice enough for all four of them all right.

There was rice enough for all four of them all right

"Enough" belongs to the category (part of speech) determinative (subtype sufficiency determinative) and its function here is that of post-head modifier.

It can also function as a determiner in examples like "I haven't got enough money."