[Dune] [#622] Semantics of Conversion

[Dune]

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The following task has a new comment added:

FS#622 - Semantics of Conversion
User who did this - Markus Blatt (mblatt)

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I just took another look and realized that I was wrong.

I actually use it to test whether I can convert a Mutable iterator to a const iterator in the generic iterator. Therefore it is a test whether there is a copy constructor of To that takes an instance of From as an argument.

The proposed changes break e.g. the generic iterator by deactivating equality tests between const and mutable iterators.

Introducing IsBaseOf is probably a good idea.
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