Lua元表的使用

最新推荐文章于 2024-06-02 14:40:10 发布

原创最新推荐文章于 2024-06-02 14:40:10 发布 · 320 阅读

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Window = {}

Window.prototype = {x = 0, y = 0, width = 100, height = 200,}

Window.mt = {}

function  Window.new( o )
	setmetatable( o, Window.mt )
	return o
end

Window.mt.__index = function ( table, key )
	return Window.prototype[key]
end

w = Window.new{x = 10, y = 20}
print(w.width)

function setDefault( t, d )
	local mt = {__index = function() return d end}
	setmetatable( t, mt )
end

tab = {x = 10, y = 20 }
print( tab.x, tab.y, tab.z )
setDefault( tab, 0 )
print( tab.x, tab.y, tab.z )