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lua指针

问题:Write an iterator fromto such that the next two loops become
equivalent:
for i in fromto(n, m)
   <body>
end

for i = n, m
   <body>
end

Can you implement it as a stateless iterator?


解答:

function iter(m,i)
   i = i + 1
   if(i <= m) then        
       return i,m
   end
end

function fromto(n, m)
   return iter,m,n-1     --返回指针函数,不变量,控制变量

end
n=91
m=100
for i,j in fromto(n,m) do
   print(i, m)
end

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