giles
f5122a9a5d
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Models a bank account using a mutable record + a user exception:
type account = { mutable balance : int }
exception Insufficient
let withdraw acct amt =
if amt > acct.balance then raise Insufficient
else acct.balance <- acct.balance - amt
Sequence:
start 100
deposit 50 150
withdraw 30 120
withdraw 200 raises Insufficient
handler returns acct.balance (= 120, transaction rolled back)
Combines mutable record fields, user exception declaration,
try-with-bare-pattern, and verifies that a raise in the middle of a
sequence doesn't leave a partial mutation.
59 baseline programs total.