MessagePack for D released

[Lars T. Kyllingstad]

On 04/27/2010 06:54 PM, tama wrote:
> On Tue, 27 Apr 2010 21:27:35 +0900, Lars T. Kyllingstad
> <public at kyllingen.nospamnet> wrote:
>
>> Phobos should definitely have a serialisation module, and this seems
>> to me like a good candidate. I haven't tried the code myself, but it
>> looks very clean and the examples are nice.
> Thanks!
>
>> I consider it a huge plus that it uses an existing format that already
>> has APIs for a bunch of programming languages.
> I agree. At first, I checked several serialization libraries.
> As a result, I select MessagePack with all things considered.
> Other libraries and Specs seem to be large and complex.
>
>> Two questions:
>>
>> The packer can write to an arbitrary ubyte output range, but it seems
>> the unpacker is limited to ubyte[] arrays. Would it be possible to
>> unpack from an arbitrary input range?
> No. Unpacker is possible to do so if D has integrated stream.
> For your information, Other implementation(e.g. Java) uses InputStream.
>
>> It doesn't seem to support the real type. It this a limitation of the
>> MessagePack format or just an oversight? Even if the format doesn't
>> directly support 80-bit floats, it should be possible to wrap them
>> somehow.
> Good point. MessagePack doesn't define real type(80-bit float) because
> some languages don't have real. But MessagePack has free format space,
> so some implementation can support language-specific format.
>
> real has environment-dependent problem. This problem causes loss of
> precision.
> Unpacker can't be responsible for this problem. OK?
>
> I will try to implement real support.

For systems where real is 64 bits it may be possible to use an 80-bit 
std.numeric.CustomFloat as an intermediate step between the stored data 
and the 64-bit type.

-Lars