partial class

[Julio César Carrascal Urquijo]

Hello Ary,

> Mike James escribió:
> Julio's second example convinced me that partial classes are useful.
> But in D you can already do that, sort of:


Yes that's possible right now but, sadly, it can't do this:

class Foo
{
	mixin GeneratedFoo!();
}

// far, far away
template GeneratedFoo()
{
	void three() { }
	void four()
	{ 
		one();	// Might not be implemented by the class
	}
}

Which means that Foo has to be polluted with default implementations of every 
partial method. In C# the user can decide which methods to implement:

// Controlled by the user.
partial class Foo
{
}

// Controlled by the tool.
partial class Foo
{
	partial void one();

	void four()
	{
		one();
	}
}