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实现加法(__add)重载代码示例：
do
local Infor_class = {};
function Infor_class.create(_t)
local newTable = {};
setmetatable(newTable, Infor_class); --set the metatable
for i, v in pairs(_t) do
newTable[i] = v;
end
return newTable;
end
function Infor_class.sum(c1, c2)
if(#c1 ~= #c2) then
return nil;
else
local result = {};
local len = #c1;
for i = 1, len do
result[i] = c1[i] + c2[i];
end
print("result");
return result;
end
print("nil");
return nil;
end
Infor_class.__add = Infor_class.sum --override the _add
r1 = Infor_class.create{3, 4}
r2 = Infor_class.create{5, 6};
result = r1 + r2;
print(unpack(result));
end
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