Question about eponymous template trick

MrSmith via Digitalmars-d-learn digitalmars-d-learn at puremagic.com
Mon Nov 3 06:22:59 PST 2014


On Monday, 3 November 2014 at 14:07:55 UTC, Uranuz wrote:
> I have an example of code like this:
>
> template Node(String)
> {
> 	struct Node {}
> 	struct Name {}
> 	struct Attr {}
> 	
> }
>
> void main()
> {
> 	alias MyNode = Node!(string).Node;
> 	alias MyName = Node!(string).Name;
> 	alias MyAttr = Node!(string).Attr;
> 	
> }
>
> This code fails during compilation with message:
>
> Compilation output:
>
> /d228/f410.d(12): Error: no property 'Node' for type 
> 'Node!string' /d228/f410.d(12): Error: no property 'Node' for 
> type 'Node!string' /d228/f410.d(13): Error: no property 'Name' 
> for type 'Node!string' /d228/f410.d(13): Error: no property 
> 'Name' for type 'Node!string' /d228/f410.d(14): Error: no 
> property 'Attr' for type 'Node!string' /d228/f410.d(14): Error: 
> no property 'Attr' for type 'Node!string'
>
> So question is: is this intended behaviour and I'm missing 
> something about eponymous templates? Or is it a bug in compiler?

Looks like compiler looks for Node, Name and Attr in Node struct, 
because of eponymous thing.
This code works though:

template N(String)
{
	struct Node {}
	struct Name {}
	struct Attr {}
	
}

void main()
{
	alias MyNode = N!(string).Node;
	alias MyName = N!(string).Name;
	alias MyAttr = N!(string).Attr;
	
}


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