在 Fri, 04 Sep 2009 04:39:28 +0800，Sclytrack <[email protected]> 写道:
I was wondering if the following is useful, probably not.
Reserve a spot on the vtable, which is automatically set to NULL.
class AClass
{
__virtualspot void caption(string text); //no implementation
__virtualspot string caption();
}
I think the above is designed for .di files. However, maybe we should
limit it to di only. If it's in .d, it probably a bug or workaround of dmd
bugs.
class BClass:AClass
{
}
BClass b = new BClass();
b.caption = "test"; //compiles
1. Would compile. But it would not run if the vtable spot
has not been filled up by some API.
2. Can derive from the class/interface, without providing
the implementation.
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