Compile-time variables

[Kayomn]

On Friday, 6 April 2018 at 02:18:28 UTC, Kayomn wrote:
> On Friday, 6 April 2018 at 01:22:42 UTC, Kayomn wrote:
>> On Friday, 6 April 2018 at 01:14:37 UTC, ketmar wrote:
>>> Kayomn wrote:
>>>
>>>> [...]
>>>
>>> it is already done for you, free of charge.
>>>
>>> 	class Node {}
>>> 	class RootNode : Node {}
>>> 	class SpriteNode : Node {}
>>>
>>> 	void main () {
>>> 		auto nodeId1 = typeid(Node);
>>> 		auto nodeId2 = typeid(SpriteNode);
>>> 		auto comparison = typeid(Node);
>>>
>>> 		Node n = new SpriteNode();
>>>
>>> 		assert(typeid(Node) is typeid(Node)); // obviously
>>> 		assert(typeid(SpriteNode) !is typeid(Node)); // sure
>>> 		assert(typeid(Node) is nodeId1);
>>> 		assert(typeid(n) is nodeId2);
>>> 	}
>>
>> Oh neat, thanks. I've been really scraping my head over this, 
>> and was worried I wouldn't be able to keep supporting my D 
>> version of the project.
>
> Hmm... doesn't seem to operate at compile-time, which is an 
> issue if I want to use it in case switch table like I was going 
> to:
>
> --------------------------------------------------------------------------------
> switch (queryInteger(childJson,"type")) {
> 	case NodeType.Sprite:
> 		child = this.addChild!(Sprite)(childName);
>
> 		break;
>
> 	default:
> 		child = this.addChild!(Node)(childName);
>
> 		break;
> }
> --------------------------------------------------------------------------------

Wrong example code, here's the correct example:
--------------------------------------------------------------------------------
switch (queryString(childJson,"type")) {
	case (typeof (Sprite).name):
		child = this.addChild!(Sprite)(childName);

		break;

	case (typeof (Camera).name):
		child = this.addChild!(Camera)(childName);

		break;

  	default:
  		child = this.addChild!(Node)(childName);

		break;
}
--------------------------------------------------------------------------------