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poly_int
sAddition, subtraction, negation and bit inversion all work normally for
poly_int
s. Multiplication by a constant multiplier and left
shifting by a constant shift amount also work normally. General
multiplication of two poly_int
s is not supported and is not
useful in practice.
Other operations are only conditionally supported: the operation might succeed or might fail, depending on the inputs.
This section describes both types of operation.