Cap'n Proto for D v0.1.2

[Thomas Brix Larsen via Digitalmars-d-announce]

On Wednesday, 19 April 2017 at 19:30:03 UTC, Thomas Brix Larsen 
wrote:
> On Wednesday, 19 April 2017 at 18:24:46 UTC, Jay Norwood wrote:
>> [...]
>>
>> Ok, thanks. I took a look at several capnproto implementations 
>> just now, and didn't see any tests for a mmap 'feature'.  The 
>> roadmap doc below indicates it doesn't exist, and perhaps 
>> there are some details yet to be resolved to make it 
>> 'friendly' for a mmap.
>
> But reading using random access *is* a feature of Cap'n Proto. 
> So when reading a memory mapped Cap'n Proto file, getters will 
> be faster if you use it in a non-sequential way.
>

I have made some minor changes to make adaptors responsible for 
allocating buffers. This made it possible to add a new adaptor 
MemoryMapped and a sample[1] to show it off.

I have also verified that no buffer allocations happen while 
reading using MemoryMapped.

Note that writing using memory mapping is still not possible.

[1]: 
https://github.com/ThomasBrixLarsen/capnproto-dlang/blob/master/source/samples/mmap.d