Constructor template -- bug?

[Jonathan M Davis]

On Tuesday 01 March 2011 23:43:27 Jonathan M Davis wrote:
> On Tuesday 01 March 2011 22:18:49 Bekenn wrote:
> > Code:
> > 	class MyException : Exception
> > 	{
> > 	
> > 		this(string message, string file, size_t line, Throwable next = null)
> > 		{
> > 		
> > 			super(message, file, line, next);
> > 		
> > 		}
> > 		
> > 		this(string file = __FILE__, size_t line = __LINE__)(string message,
> > 
> > Throwable next = null)
> > 
> > 		{
> > 		
> > 			this(message, file, line, next);
> > 		
> > 		}
> > 	
> > 	}
> > 	
> > 	void main()
> > 	{
> > 	
> > 		throw new MyException("Bluh!");
> > 	
> > 	}
> > 
> > Error message:
> > 	test.d(8): Error: template test.MyException.__ctor(string file =
> > 
> > __FILE__,size_t line = __LINE__) conflicts with constructor
> > test.MyException.this at test.d(3)
> > 
> > If I remove the normal constructor and call super instead of this from
> > 
> > the constructor template, then I get this slightly different error message:
> > 	test.d(1): Error: constructor test.MyException.this conflicts with
> > 
> > template test.MyException.__ctor(string file = __FILE__,uint line =
> > __LINE__) at test.d(3)
> > 
> > Is this a compiler bug, or am I Doing It Wrong?
> 
> You cannot currently templatize class constructors:
> 
> http://d.puremagic.com/issues/show_bug.cgi?id=435
> 
> And currently if one overload of a function is templatized, _all_ overloads
> of that function must templatized:
> 
> http://d.puremagic.com/issues/show_bug.cgi?id=2972
> http://d.puremagic.com/issues/show_bug.cgi?id=4749

I should also point out that there is absolutely no need to use template for 
what you're trying to do. Just declare the constructor like so:

this(string message, string file = __FILE__, size_t line = __LINE__ Throwable 
next = null) { ... }

- Jonathan M Davis