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Cc: Bitcoin Development <bitcoin-development@lists.sourceforge.net>
Subject: Re: [Bitcoin-development] BIP - Hash Locked Transaction
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Does it make sense to implement a generic Policy interface (abstract
class) which StandardPolicy extends?

Maybe you can then implement a WhitelistPolicy,
ReplacebyFeeStandardPolicy, ReplacebyFeeWhitelistPolicy...

This would make it simpler for miners to implement their own policies
in general.
The following functions (maybe more) could become methods of Policy:

script IsStandard
main IsStandardTx
main AcceptToMemoryPool