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.
