Re: Scripting language takes a silicon turn
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- Subject: Re: Scripting language takes a silicon turn
- From: Raffaele Salmaso <raffaele.salmaso@...>
- Date: 2006年1月26日 09:11:49 +0100
David Given ha scritto:
FWIW, Raffaele Salmaso wrote a very neat object system based on closures where
you used . to invoke methods. Pluses: the syntax change; instance data in
methods was stored as upvalues, not table entries, making them an order of
magnitude faster to access. Minuses: constructing objects was far more
expensive, as you had to construct new closures for all the methods to bind
the self parameter in.
here is the class function
---8<---
function class(super)
-- create a new class description
local klass = {}
-- set the superclass (for object inheritance)
setmetatable(klass, {
__index = super,
__call = function(self, ...)
local tmp = {}
setmetatable(tmp, klass)
if self.init do
self.init(tmp, unpack(arg))
end
return tmp
end
})
klass.__index = function(table, key)
local r = klass[key]
if type(r) == 'function' do
local f = function(...) return r(table, unpack(arg)) end
table[key] = f
return f
else
return r
end
end
return klass
end
--->8---
with this function you can create classes and use the dot notation for
calling methods.
stupid and useless class:
Animal = class()
function Animal.init(self, name)
print(name)
self.name = name
end
function Animal.canSitDown(self)
return 'yes'
end
local a = Animal('otto')
print(a.canSitDown()) --> 'yes'
--
()_() | NN KAPISCO XK' CELLHAVETE T'ANNTO CN ME SL | +----
(o.o) | XK' SKRIVO 1 P'HO VELLOCE MA HALL'ORA DITTELO | +---+
'm m' | KE SIETE VOI K CI HAVVETE PROBBLEMI NO PENSATECI | O |
(___) | HE SENZA RANKORI CIAOOOO |
raffaele punto salmaso at gmail punto com