niwinz
commented
7 years ago Hi @sj4
The question here is, that it means the two focuses are the same? The response can be:
- Points to the same location as the other (pretty imposible to implement due to the design of lenses composition, because it is simple function composition).
- The value of two lenses is the same (it posible but maybe is not that you want)
- The lense is identical to other (in this case we don't need check for id equality, it just can be checked with
identical?predicate.
Maybe I'm missing something, but I don't find where the IEquiv can be useful for focuses, can you elaborate more please!
ghost
In an app I'm currently developing I found a use cases where it would be beneficial if I could check if two lenses are the same. Currently this is only possible by using deref and compare the values (and that does not guarantee the lenses are pointing at the same location in a datastructure)
would it be possible to implement IEquiv, e.g. by comparing the id of the lens?