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Merge pull request #35 from typelist/master

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Reintroduce CheckedAddressDiff now that multidispatch works
This commit is contained in:
Johannes Muenzel 2014-12-18 19:18:42 -05:00
commit bd30f8c6cc
1 changed files with 6 additions and 14 deletions
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20
src/address.rs
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@ -25,6 +25,8 @@
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE. // POSSIBILITY OF SUCH DAMAGE.
use std::num::Int;
// The idea here is that it doesn't make sense to add two addresses, but it // The idea here is that it doesn't make sense to add two addresses, but it
// does make sense to add an address and an "address-difference". (If this // does make sense to add an address and an "address-difference". (If this
// is too annoying to work with we should let it go.) // is too annoying to work with we should let it go.)
@ -50,30 +52,20 @@ impl Add<AddressDiff, AddressDiff> for AddressDiff {
} }
} }
// rustc doesn't seem to like having multiple implementations of Add for #[deriving(Copy, PartialEq, Eq, PartialOrd, Ord)]
// Address. I believe this is a Rust bug (possibly resolved by "associated
// types" RFC?). Or I wrote it wrong. Anyway, here's some living dead code:
/*
#[deriving(PartialEq, Eq, PartialOrd, Ord)]
pub struct CheckedAddressDiff(u16); pub struct CheckedAddressDiff(u16);
impl Add<CheckedAddressDiff, Address> for Address { impl Add<CheckedAddressDiff, Address> for Address {
fn add(&self, &CheckedAddressDiff(rhs): &CheckedAddressDiff) -> Address { fn add(self, CheckedAddressDiff(rhs): CheckedAddressDiff) -> Address {
let &Address(lhs) = self; let Address(lhs) = self;
// We probably don't want to overflow when doing arithmetic in our own // We probably don't want to overflow when doing arithmetic in our own
// code. // code.
debug_assert!({ debug_assert!(lhs.checked_add(rhs).is_some());
match lhs.checked_add(&rhs) {
None => false,
_ => true
}
});
Address(lhs + rhs) Address(lhs + rhs)
} }
} }
*/
impl Address { impl Address {
pub fn to_u16(&self) -> u16 { pub fn to_u16(&self) -> u16 {