Output ranges and arrays

[Steven Schveighoffer]

On Fri, 12 Nov 2010 09:22:20 -0500, Olivier Pisano  
<olivier.pisano at laposte.net> wrote:

> Hi,
>
> I am starting to play with output ranges and have trouble understanding  
> how they do work on arrays. Consider the following code :
>
> 	import std.array;
> 	import std.range;
> 	import std.stdio;
>
> 	void main(string[] argv)
> 	{
> 	    auto a = [1, 2, 3];
> 	    a.put(4);
>
> 	    writefln("%s", a);
> 	}
>
> One could expect the call to put() to append 4 to the array so the array  
> content would be [1, 2, 3, 4].
> Instead of this, I get "[2, 3]" to be printed. So I guess put() is  
> translated to
>
> 	r.front = e; r.popFront();
>
> as written in std.range.put documentation.
>
> Is it the expected behaviour or is it a bug ?

Expected.  If you want an appendable array as an output range, use  
std.array.Appender.

auto a = appender([1,2,3]);
a.put(4);
writefln("%s", a.data);

-Steve