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- Subject: Re: Documentation
- From: David Jones <djones@...>
- Date: Mon, 11 Dec 2000 12:45:31 +0000
In message <Pine.LNX.email@example.com>, Re
uben Thomas writes:
> > In section 3, you say "The form t:f(x) is syntactic sugar for t.f(t,x), whi
> > calls the method f from the table t passing the table itself as the first
> > parameter (see Section 4.5.9).".
> > In section 4.5.9, you say "The statement function v:f (...) ... end is just
> > syntactic sugar for v.f = function (self, ...) ... end
> > Note that the function gets an extra formal parameter called self."
> You're just confusing formal and actual parameters: if you define a function
No the manual draws the correct distinction.
> v:f () ... end
> you actually get
> v.f = function (self) ... end
IE the function is declared with an extra formal parameter called self.
> and then when you call it with v:f(), the actual call made is v:f(v), so
> self gets set to v within f.
IE v:f() generates a call to f with an extra actual parameter (the value
of v). This actual parameter doesn't have to be bound to the formal
parameter self. I could declare my function:
v.f = function (a, b, c, self) ... end
Though that would probably be confusing.
Conversely, I don't have to call a function that I declared function
v:f() using the v:f() syntax.