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Date: 2005-04-18 (09:18)
From: Christophe DEHLINGER <christophe.dehlinger@i...>
Subject: type of ==
Hi all,

I was recently in a situation where I would have liked to be able to 
test physical equality on terms of possibly different types, but 
couldn't because of =='s 'a -> 'a -> bool type.
Why isn't its type 'a -> 'b -> bool ? Is there more to the 
implementation of == than a simple physical, asm-level equality test ?
Is it because of the semantics of == ? If so, is a 'a -> 'b -> bool 
equivalent possible / already existing ? I guess something like fun a b 
-> a == (Obj.magic b) should work, but regular posts on this list have 
gradually scared me off from ever using the obscure Obj module.

Christophe Dehlinger


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