Logical const in D

Question

D has two types of constness: immutable variables are ones that were declared immutable, and always will be immutable, while const variables are simply rea

Answer 1

Being a pragmatic language, D has the ability to cast away const if you really need to. I think the following should work:

class M {
  bool set;
  real val;

  real D() const {
    if(!set) {
      M m = cast(M)this;
      m.val = this.some_fn();
      m.set = true;
    }
    return this.val;
  }
}