It seems to me the hard part (threading algorithm) is already done for you as long as you make your objects look like the objects it expects. So why not find all the methods actually used by the Mail|Email::Thread module for threading and create wrapper methods in yours -- that is, implement the common interface. This way you get threading for free and the wonderful side-effect of decoupled code.

Chris
M-x auto-bs-mode

In reply to Create an interface (was: Message threading) by lachoy
in thread Message threading by sschneid

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