std.stream.MemoryStream deprecated, range is the alternative?

[anonymous via Digitalmars-d-learn]

On Thursday, 6 August 2015 at 17:01:32 UTC, chris wrote:
> since memorystream is deprecated how do i do something like 
> this with Input and Output ranges? How can i fill up an array 
> with ranges like you can do with streams?
> Thanks.

The InputRange primitives already exist for arrays, they are 
located in std.array, as well as the functions to insert 
elements. To achieve more advanced mutations use std.algorithm.

---
import std.stdio;
import std.array;
import std.algorithm;

byte B(T)(T t){return cast(byte) t;}

struct FillerDemo
{
     private byte cnt;
     byte front(){return cnt;}
     void popFront(){++cnt;}
     @property bool empty(){return cnt == 8;}
}

void main(string[] args)
{
     auto rng = [0.B, 2.B, 4.B, 6.B, 8.B, 10.B, 12.B];
     // reads then advances, destructively
     byte val = rng.front;
     writeln(val);
     rng.popFront;
     // fills with an array
     insertInPlace(rng, 0, [-4.B, -2.B, 0.B]);
     writeln(rng);
     rng = rng.init;
     // fills with a compatible range
     insertInPlace(rng, 0, *new FillerDemo);
     writeln(rng);
     // std.algorithm
     reverse(rng);
}
---

Note, if you don't know yet, that ranges are consumed. The front 
is lost each time popFront() is called.