Streaming interfaces

[John]

I'm toying with writing an apache avro library and it probably 
makes sense to write it to a streaming interface. However, the 
warnings on std.stream / std.c.stream (together with the lack of 
implementations) suggest that's a bad idea.

If I want to provide an interface that does data transformation 
but results in minimal data copying when coming to or from disk, 
network or RAM, where would your recommend I look? I see 
std.container, std.outbuffer, dynamic arrays, and I have little 
sense of how I should expose a public interface.

Thanks for any advice.