middleclass & extras: middleclass 3.0 is out!

[leiradel]

What happens if you have method "a" in a class and the class includes a mixin which has also an "a" method when using middleclass? Which one will instances use?

I'm starting to think I can switch from my own OOP implementation back to middleclass...

Cheers,

Andre

[BlackBulletIV]

I know in PHP 5.4 (they call mixins traits) handles that situation by allowing the user to choose:

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class Foo
{
    use TraitA, TraitB
    {
        use TraitA::a insteadof TraitB::a;
    }
}

EDIT: Oh hang on, you're talking about class versus mixin, not mixin versus mixin.

[kikito]

What happens if you have method "a" in a class and the class includes a mixin which has also an "a" method when using middleclass? Which one will instances use?

On middleclass the rule is: the last method included on the class (via includes or regular definitions) always wins.

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Cow = class('Cow')

function Cow:talk() print('original method') end

local lily = Cow:new()

lily:talk() -- original method

Mixin = { function talk() print('mixin method') end }

Cow:include(Mixin) -- this will copy Mixin.talk over Cow.talk

lily:talk() -- mixin method

-- this will not change anything, since Mixin.talk was copied, not just 'referenced' on Cow
Mixin.talk = function() print('modified mixin method') end

lily:talk() -- mixin method

-- this will copy a new talk implementation on Cow
function Cow:talk() print('overriden mixin method') end

lily:talk() -- overriden mixin method

Notice that this particular example would work for class methods as well (replacing lily:talk() by Cow:talk())

[kikito]

Middleclass 1.3 is out!

This is a backwards-incompatible update.

The only change is that I've removed super.

On middleclass 1.2, you could do this:

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MySubClass = class('MySubClass', MySuperClass)

function MySubClass:initialize()
  super.initialize(self, ...)
end

On 1.3, you can't invoke 'super' any more. You have to explicitly use 'MySuperClass' instead, like this:

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MySubClass = class('MySubClass', MySuperClass)

function MySubClass:initialize()
  MySuperClass.initialize(self, ...)
end

This change was done for performance and elegance reasons; super was adding too much overhead to middleclass, both in terms of efficiency and maintenance effort. The benefits it gave were just not worth the trouble. Feedback from the community helped me figure that one out.

I've also updated middleclass-extras (now 0.9) to account for this change.

Regards!

[BlackBulletIV]

Awesome! I better get to work and convert Grace to be compatible.

[TechnoCat]

I can't get Class:implements(Stateful) to work anymore.

[BlackBulletIV]

Aren't you meant to use Class:include(Stateful)?

[slime]

I think the syntax is now

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MyClass:include(Stateful)

EDIT: Ninja'd.

[leiradel]

Middleclass 1.3 is out!

This is a backwards-incompatible update.

Sweet, thanks!

Shouldn't you bump the version up to 2.0 since it's a backwards-incompatible release?

Cheers,

Andre

[TechnoCat]

Yeah, :include is right.
I was looking at the doc in the head of the Stateful file https://github.com/kikito/middleclass-e ... ateful.lua