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two usages of continuations


From: Matt Wette
Subject: two usages of continuations
Date: Wed, 9 May 2018 16:55:50 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0

Hi All,

I'm currently reading a paper that references [1] to state that there exist two 
usages of continuations.
1) if invoked continuation is prefix of current continuation, it is downward
2) otherwise it is upward

Would anyone like a shot at elaborating this?
Does this mean a called continuation is downward if it is a tail call?

Matt


[1] Haynes, Friedman, Wand, "Obtaining Coroutines with Continuations," Comput. 
Lang., 11(3/4), 1986.





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