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counter = {
count = 0
}
function counter.get(self)
return self.count
end
function counter:inc()
self.count=self.count+1
end
print(counter.get(counter))
counter.inc(counter)
print(counter.get(counter))
counter2={
count=4,
get = counter.get,
inc = counter.inc,
}
print(counter2:get())
counter.inc(counter2)
print(counter2.get(counter2))
print()
tb1 ={ "alpha","beta","gamma"}
mt={}
setmetatable(tb1,mt)
print(getmetatable(tb1) == mt)
print()
function mt.__add(a,b)
local result = setmetatable({},mt)
for i=1,#a do
table.insert(result,a[i])
end
for i=1,#b do
table.insert(result,b[i])
end
return result
end
tb2={"aaa","bbb","ccc"}
res=tb1+tb2
for i,v in ipairs(res) do
print(v)
end
print()
function mt.__unm(a)
local result = setmetatable({},mt)
for i=#a , 1 ,-1 do
table.insert(result,a[i])
end
return result
end
res=-tb1+tb2
for i,v in ipairs(res) do
print(v)
end
print()
function mt.__tostring(a)
local result = "{"
for i,v in ipairs(a) do
result = result.." "..v
end
result = result.." } "
return result
end
print(tb1)
function mt.__index(tb1,key)
print("there is no "..key.." in the table")
return nil
end
print(tb1["fsy"])
function mt.__newindex(a,key,v)
if( key == "haha") then
error(" stop laugh!",2)
else
rawset(a,key,v)
end
end
tb1.haha="heihei"
运行结果：
0
1
4
5
true
alpha
beta
gamma
aaa
bbb
ccc
gamma
beta
alpha
aaa
bbb
ccc
{ alpha beta gamma }
there is no fsy in the table
nil
lua: my_test.lua:166: stop laugh!
stack traceback:
[c]: in function 'error'
my_test.lua:160: in function <my_test.lua:158>
my_test.lua:166: in main chunk
[c]: ?
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