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Created page with "A complete tutorial about classes is written here: http://www.inspired-lua.org/2011/05/5-object-classes/ Here's how the class() function is defined, in the API : <source lang="..."
A complete tutorial about classes is written here: http://www.inspired-lua.org/2011/05/5-object-classes/
Here's how the class() function is defined, in the API :
<source lang="lua">
-- Class definition system
class = function(prototype)
local derived = {}
local derivedMT = {
__index = prototype,
__call = function(proto, ...)
local instance = {}
local instanceMT = {
__index = derived,
__call = function()
return nil, "attempt to invoke an instance of a class"
end,
}
setmetatable(instance, instanceMT)
if instance.init then
instance:init(...)
end
return instance
end,
}
setmetatable(derived, derivedMT)
return derived
end
</source>
Here's how the class() function is defined, in the API :
<source lang="lua">
-- Class definition system
class = function(prototype)
local derived = {}
local derivedMT = {
__index = prototype,
__call = function(proto, ...)
local instance = {}
local instanceMT = {
__index = derived,
__call = function()
return nil, "attempt to invoke an instance of a class"
end,
}
setmetatable(instance, instanceMT)
if instance.init then
instance:init(...)
end
return instance
end,
}
setmetatable(derived, derivedMT)
return derived
end
</source>
