云风的个人空间 : Comment59

这是一个 ChenZiFeng?在Lua 函数重载于2011-09-18 01:04:17写下的留言.

参考云风实现重载方式，自己YY了一下

_G.index=function(t,key)

return getCall(t,key)

end
setmetatable(_G,_G);
local functionList={}
local callList={}
function getParamKey(param,isGetType)

local keyString if param

nil or (param and #param

0 ) then -- 处理空参数

return "nil"

end for i=1,#param do

if keyString

nil then if isGetType then keyString = type(param[i]) else keyString = param[i] end else if isGetType then keyString = keyString..","..type(param[i]) else keyString = keyString..","..param[i] end end end return keyString end function register(funName,param,fun) if functionList[funName]

nil then functionList[funName]={}

end functionList[funName][getParamKey(param)] = fun if callList[funName] then return end local call =function(...)

local callHandler = functionList[funName][getParamKey(arg,true)] if callHandler

nil then -- 处理不定参 callHandler = functionList[funName]["..."] if callHandler

nil then

local paramList="" for i=1,#arg do

paramList = paramList .. type(arg[i]) callHandler = functionList[funName][paramList.. "," .. "..."] if callHandler then

do break end

end

end callHandler(unpack(arg))

end callList[funName]=call

end
register("say",nil,function()

print("执行了")

end)
register("say",{"string"},function(str)

print(str)

end)
register("say",{"number"},function(num)

print(num)

end)
register("say",{"number","number","number"},function(num,num1,num2)

print(num)

end)
register("say",{"string","string"},function(str,str2)

print(str,str2)

end)
register("say",{"table","string"},function(t,str2)

print(t,str2)

end)
register("say",{"string","..."},function(str,...)

print(str,arg)

end)
register("kao",{"string"},function(str)

print(str)

end)
--[[register("say",{"..."},function(ta,str2) print(ta,str2) end)--]]

function getCall(t,key)

if functionList[key] then

return callList[key]

end return t[key]

end
say()
say("asdasd")
say(2)
say(1,2,3)
say("asdsad","asdsad123")
say({"123"},"asdsad123")
say("123","asdsad123",1,23,231,3,213,21,3,213)
kao("我爱你中国")

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