10.6 Computing bounds on poly_int
s
poly_int
also provides routines for calculating lower and upper bounds:
- ‘constant_lower_bound (a)’
- Assert that a is nonnegative and return the smallest value it can have.
- ‘lower_bound (a, b)’
- Return a value that is always less than or equal to both a and b.
It will be the greatest such value for some indeterminate values
but necessarily for all.
- ‘upper_bound (a, b)’
- Return a value that is always greater than or equal to both a and
b. It will be the least such value for some indeterminate values
but necessarily for all.