你怎么能最好地在字节串上提供通用接口？

Question

I'd like to offer a "user friendly" generic interface for a library I'm writing. It seems like the thing that ought to already exist, so I'd like to not reinvent the wheel.

At it's heart, the library is a wrapper over a lot of C functions that take unsigned char[] . Right now I'm using vector since it was easy to understand how to use Mutable to allocate and freeze C arrays being written by the library, but the more popular interface would be ByteString . Is there a good way to transparently convert them? And/or a good way to offer a generic interface for both of them?

As an example, I'd like to be able to write a function

doIt :: ByteArrayLike ba => ba -> ba

and have it operate on ByteString and Vector Word8 identically.

Answer 1

I'm not sure what kind of operations you want on ByteString and Vector , but you could take a look at the lens package, which provides generalized operations on both.

Perhaps implement a IsByteString instance for Vector ? see here