Re: mutable array of immutable objects

[Anonymouse via Digitalmars-d]

On Tuesday, 19 April 2016 at 10:41:05 UTC, Jeff Thompson wrote:
I want to create a mutable array of immutable objects, but the 
code below gives the error shown below. It seems that "new 
immutable(C)[1]" makes the entire array immutable, but it seems 
I should be able to change the elements of an array of pointers 
to an object even though the objects are immutable. How to do 
that?

class C {
  this(int x) immutable { this.x = x; }
  int x;
}

void main(string[] args)
{
  auto array = new immutable(C)[1];
  array[0] = new immutable C(10); // Error: Cannot modify 
immutable expression array[0].
}

Mind that this is akin to declaring a string (immutable(char)[]) 
and trying to modify an element.

You can append, though. Or rather, make a new array/slice with 
the new elements concatenated into it.