Observer Pattern

[benzene]

I've often mentioned the idea of changing application programming so more responsibility is offloaded to "The System" (or "The Framework") for managing invalidation. What I'm suggesting isn't quite as pathological as "Completely recompute the layout of every page in Microsoft Word on each keystroke". But I do think that programmers could express

Comments

[earhart]

Have you done much Prolog programming?

Prolog

[benzene]

Many years ago I looked at it enough to see how it implemented the classic knowledge base "I'm thinking of an animal" process of elimination problem. (I saw one of these just the other day being marketed as an electronic handheld gadget, which I couldn't resist trying out.)

What I was messing with here really does have a lot in common with functional programming, and increasingly I saw that it needed its own language. People have enough trouble closing files that they open, so when you ask for them to write stylized C++, it's kind of a lost cause. I had come up with a few tricks, which can be simplified a bit to demonstrate what I'm talking about:

class TreeNode
{
...
private: // can't call constructors explicitly
TreeNode();
TreeNode(std::string data);
public:
static std::auto_ptr Create(std::string data); // use this instead
...
public:
TreeNode* InsertChild(std::auto_ptr child);
std::auto_ptr Detach();
...
};Then, I was using protected inheritance to make derived classes with no data members that

std::auto_ptr

[benzene]

That should read std::auto_ptr, of course.

Re: std::auto_ptr

[benzene]

figured out the problem. I'd typed everything correctly, it's just that > and < cause problems.

IT SHOULD SAY: std::auto_ptr

[olego]

Hey,

I've personally become disillusioned with C++, so I would write

TreeNode* GetParentMaybeNull

but call it simply GetParent() and expect a NULL if there is no parent.

And std confuses me. :-P

[olego]

became^

Disney Cars Online

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