pcsc: Allow a transaction to own the underlying card. #27
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- Since Rust's support for self-referencial data structures is weak,
there are cases where it is useful for a transaction to own the card
and not just for it to hold a mutable reference. In these cases,
the caller needs to explicitly end the transaction to recover the
underlying card, but that is acceptable.
- Generalize `Transaction` to be generic over a `BorrowMut<Card>`.
Add new functions `Card::begin_transaction_owned` and
`Card::begin_transaction2_owned` to create this type of transaction.
Change `Transaction::end` to return the underlying card. And, add a
variant, `Transaction::end2`, to unconditionally return the
underlying card independent of whether ending the transaction
succeeded.
- Fixes bluetech#28.
nwalfield
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I left a comment regarding this PR here: #28 (comment) |
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Since Rust's support for self-referencial data structures is weak,
there are cases where it is useful for a transaction to own the card
and not just for it to hold a mutable reference. In these cases,
the caller needs to explicitly end the transaction to recover the
underlying card, but that is acceptable.
Generalize
Transactionto be generic over aBorrowMut<Card>.Add new functions
Card::begin_transaction_ownedandCard::begin_transaction2_ownedto create this type of transaction.Change
Transaction::endto return the underlying card. And, add avariant,
Transaction::end2, to unconditionally return theunderlying card independent of whether ending the transaction
succeeded.