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Subject: [ggl] Problem intersecting linestring & polygon in Xcode 3.2.2
From: Bruno Lalande (bruno.lalande)
Date: 2010-04-26 11:58:36

Hi Barend,

> I have checked this in the meantime. It is sometimes useful to have this
> policy as non-const, because it changes its internal state and returns
> immediately. For example, to check if two linestrings are disjoint, not all
> turns (intersections) have to be checked: at the first intersection it is
> known as disjoint. So it sets that state and returns.

Is it the policy that decides to change its state within a function
that's fundamentally not a modifier? Or is the client code
(get_turns()) modifying the policy on purpose? If the former, it's
typically a case where the object should be const and the attribute(s)
changed declared mutable, since the change is internal and is the
entire decision of the policy class itself. Makes sense?


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