Lua实现__add方法重载示例

作者: 笔描相思一墨点红尘
来源: 51数据库
2021-08-08

实现加法(__add)重载代码示例：

复制代码代码如下:

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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