On Wed, May 23, 2018 at 9:00 AM, Nil Geisweiller <[email protected]>
wrote:
> I mean when run by cog-execute!, which also happens to be the standard
way of invoking the pattern matcher.
Any atom type that derives from FunctionLink has the C++ method
virtual Handle execute() const;
method on it ... which cog-execute! calls. This typically triggers a long
chain-reaction of executions (because its recursive ... there's even a way
of doing infinite recursion with it, and starting/stopping/joining threads
with it... in pure atomese. There are Atoms that create threads and join
them. This is why Atomese is a "programming language" - it supports
recursion etc.). Note that this method returns an Atom.
There used to be a cog-evaluate! that was similar but returned a
TruthValue. I do not recall if we removed it or not; if it still exists,
then it is not widely used.
It is possible that we might someday need to introduce some kind of
cog-valuate! method that returns a value, but otherwise works much like
cog-execute! However, I am extremely super-nervous about having such a
conversation right now. I think the newcomers need to have another
half-year-ish of hands-on experience before we debate such fairly
significant architectural changes. It's very important that everyone
understand the current architecture, before we just start changing it.
The existing architecture has room for a lot of things, a lot of freedom
for designing things. I'd like to stick to it as much as possible.
Linas
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