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`poly_int`

s`poly_int`

provides the following routine for sorting:

- ‘
`compare_sizes_for_sort (`’`a`,`b`) Compare

`a`and`b`in reverse lexicographical order (that is, compare the highest-indexed coefficients first). This can be useful when sorting data structures, since it has the effect of separating constant and non-constant values. If all values are nonnegative, the constant values come first.Note that the values do not necessarily end up in numerical order. For example, ‘

`1 + 1`’ would come after ‘`x``100`’ in the sort order, but may well be less than ‘`100`’ at run time.