Hey everyone, I'm new to D so bare with me please. I've been trying to figure out what's up with the strange forward refernce errors the compiler (DMD 2.060) is giving me. Here's a code snippet that's generating a forward reference error:

public class AliasTestClass(alias func)
{
	
	static assert(__traits(isStaticFunction, func));
		
}

public class TestClass
{
	
	private AliasTestClass!(randomFunction) test; // <-----
		
	public static void randomFunction()
	{
	}
	
}

The strange part about it is that if I surround the randomFunction parameter with another pair of paranthesis like so

private AliasTestClass!((randomFunction)) test;

It works just fine. If I don't, however, I get a forward reference error:
"Error: template instance main.AliasTestClass!(randomFunction) forward reference of randomFunction"

Am I doing anything wrong or is this some kind of bug?

On 2012-10-14, 14:28, Martin wrote:

> Hey everyone, I'm new to D so bare with me please. I've been trying to figure out what's up with the strange forward refernce errors the compiler (DMD 2.060) is giving me. Here's a code snippet that's generating a forward reference error:
>
> public class AliasTestClass(alias func)
> {
> 	
> 	static assert(__traits(isStaticFunction, func));
> 		
> }
>
> public class TestClass
> {
> 	
> 	private AliasTestClass!(randomFunction) test; // <-----
> 		
> 	public static void randomFunction()
> 	{
> 	}
> 	
> }
>
> The strange part about it is that if I surround the randomFunction parameter with another pair of paranthesis like so
>
> private AliasTestClass!((randomFunction)) test;
>
> It works just fine. If I don't, however, I get a forward reference error:
> "Error: template instance main.AliasTestClass!(randomFunction) forward reference of randomFunction"
>
> Am I doing anything wrong or is this some kind of bug?

It's a bug. Maybe it's already in Bugzilla (there are some forward-ref
bugs there already). Please file:

http://d.puremagic.com/issues/enter_bug.cgi

-- 
Simen

On Sunday, 14 October 2012 at 12:58:24 UTC, Simen Kjaeraas wrote:
> On 2012-10-14, 14:28, Martin wrote:
>
>> Hey everyone, I'm new to D so bare with me please. I've been trying to figure out what's up with the strange forward refernce errors the compiler (DMD 2.060) is giving me. Here's a code snippet that's generating a forward reference error:
>>
>> public class AliasTestClass(alias func)
>> {
>> 	
>> 	static assert(__traits(isStaticFunction, func));
>> 		
>> }
>>
>> public class TestClass
>> {
>> 	
>> 	private AliasTestClass!(randomFunction) test; // <-----
>> 		
>> 	public static void randomFunction()
>> 	{
>> 	}
>> 	
>> }
>>
>> The strange part about it is that if I surround the randomFunction parameter with another pair of paranthesis like so
>>
>> private AliasTestClass!((randomFunction)) test;
>>
>> It works just fine. If I don't, however, I get a forward reference error:
>> "Error: template instance main.AliasTestClass!(randomFunction) forward reference of randomFunction"
>>
>> Am I doing anything wrong or is this some kind of bug?
>
> It's a bug. Maybe it's already in Bugzilla (there are some forward-ref
> bugs there already). Please file:
>
> http://d.puremagic.com/issues/enter_bug.cgi

Oh, thank you for clarifying, I thought I was doing something wrong :)