Re: Unmanaged drop in replacemet for [] and length -= 1

[Joerg Joergonson via Digitalmars-d-learn]

On Monday, 20 June 2016 at 16:27:29 UTC, Steven Schveighoffer 
wrote:
On 6/18/16 5:55 PM, Joerg Joergonson wrote:
I wanted to switch to std.container.Array but it doesn't seem 
to mimic
[] for some odd ball reason. I threw this class together and 
it seems to
work.
The only problem is that I can't do

carray.length -= 1;

I can't override `-=` because that is on the class. can I 
override it
for length somehow or do I have to create a length wrapper 
class that
has it overridden in it? Or is there a way to do it in cArray?

length wrapper *struct*:

struct AdjustableLength
{
   cArray t;
   auto get() { return t.data.length; }
   opOpAssign(string s: "+", Addend)(Addend x)
   {
      //... your code here that does += using t
      t.data.length = get() + x;
   }
   alias get this;
}

@property auto length()
{
   return AdjustableLength(this);
}

D does not have any direct support for modification of 
properties. It has been talked about, but has never been 
implemented.

-Steve

Thanks, this is what I was thinking I'd have to do. I'm probably 
going to manually manage the array items. I just need simple 
append and remove but this will still help with the drop in 
replacement(for my cases).