• chris (26/26) Aug 06 2015 class Test {
• anonymous (36/40) Aug 07 2015 The InputRange primitives already exist for arrays, they are

"chris" <chris1 gmail.com> writes:

class Test {
     MemoryStream m_stream;

     this(MemoryStream stream) {
         m_stream = stream;
     }

     void write(byte val) {
         m_stream.write(val);
     }

     byte read() {
         byte val;
         m_stream.read(val);
         return val;
     }
}

void main() {
     byte[] read = [0, 2, 4, 6, 8, 10, 12];
     auto t = new Test(read);
     byte val = t.read();
     t.write(1);
     byte val1 = t.m_stream.data;
     writeln(val, val1);
}


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.

"anonymous" <anonymous 12321.23> writes:

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.