Re: inout, delegates, and visitor functions.

[ponce via Digitalmars-d-learn]

On Saturday, 24 October 2015 at 11:28:17 UTC, Sebastien Alaiwan 
wrote:
Hi ponce,
Thanks for your suggestion.
I think I may have found the beginning of a solution:
class E
{
  import std.traits;

  void apply(this F, U)(void delegate(U e) f)
    if(is(Unqual!U == E))
  {
    f(this);
  }

  int val;
}

int main()
{
  void setToZero(E e)
  {
    e.val = 0;
  }

  void printValue(const E e)
  {
    import std.stdio;
    writefln("Value: %s", e.val);
  }

  E obj;

  obj.apply(&setToZero);
  obj.apply(&printValue);

  const(E) objConst;
  //objConst.apply(&setToZero);
  objConst.apply(&printValue);

  return 0;
}



Clever. It works because of const inference on template functions.
Didn't know you could use 'this' as a type.