Which template is recommended.

[sclytrack]

Below there are two routines with the same name.
Apparently both can be present at the same time.

Which one of the two is the recommended code?



import std.stdio;

interface ITest
{
	int first();
	int second();
}

class Test: ITest
{
	int first()
	{
		writeln("first");
		return 1;
	}
	
	int second()
	{
		writeln("second");
		return 2;
	}
}

void routine(T:ITest) (T a)
{
	a.second();	
}

void routine(T) (T a) if (is(T:ITest))
{
	a.first();
}

int main()
{
	routine(new Test());
	return 0;
}


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The above example prints out first.