> From: Sanghyeon Seo [EMAIL PROTECTED]
> Sent: Friday, 29 February 2008 2:23 PM
> To: [email protected]
> Subject: Re: [Ironruby-core] digest.so implemented
>
> Hash implementations are fully managed (in .NET and Mono), and shallow
> copying by MemberwiseClone does give the correct semantics *now*.
Are you sure? Which version of the .NET framework are you assuming? Are you
claiming it works on .NET 2.0?
Consider the following C# snippet:
HashAlgorithm digest = MD5.Create();
HashAlgorithm clone =
(HashAlgorithm)digest.GetType().GetMethod("MemberwiseClone",
BindingFlags.Instance | BindingFlags.NonPublic).Invoke(digest, null);
clone.TransformFinalBlock(new byte[0], 0, 0);
byte[] block = new byte[] {1, 2, 3, 4};
digest.TransformBlock(block, 0, block.Length, block, 0);
On .NET 2.0, the final line fails despite the fact that only the clone has been
finalized.
This corresponds to the following Ruby use case:
digest = Digest::MD5.new
digest << 'Initial'
puts digest.hexdigest
digest << 'add some more'
puts digest.hexdigest
You could argue that such useage is unlikely in practice, but it seems to me
that the CRuby implementation was specifically designed to support this case -
why else would they bother cloning?
Cheers, Wayne.
BTW, how does one code (BindingFlags.Instance | BindingFlags.NonPublic) in
IronRuby?
I had to resort to
System::Enum.ToObject(System::Reflection::BindingFlags.Instance.GetType(), 36)
Is there a simplier/more elegant solution?
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