练习3-45原文
Exercise 3.45. Louis Reasoner thinks our bank-account system is unnecessarily complex and error-prone now that deposits and withdrawals aren’t automatically serialized. He suggests that make-accountand-serializer should have exported the serializer (for use by such procedures as serializedexchange) in addition to (rather than instead of) using it to serialize accounts and deposits as makeaccount did. He proposes to redefine accounts as follows:
amount) balance (- balance amount))balance)amount)(set! balance (+ balance amount))balance)))) m ‘deposit) m ‘serializer) balance-serializer)m))))dispatch))
Then deposits are handled as with the original make-account:
‘deposit) amount))
Explain what is wrong with Louis’s reasoning. In particular, consider what happens when serializedexchange is called.
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做对的事情比把事情做对重要。
