add gs

RCCService2018/content/LuaPackages/TestEZImpl/Stack.lua

@@ -0,0 +1,38 @@
+local Stack = {}
+Stack.__index = Stack
+
+function Stack.new()
+	local self = {}
+	setmetatable(self, Stack)
+	self.data = {}
+	return self
+end
+
+function Stack:size()
+	return #self.data
+end
+
+function Stack:push(obj)
+	self.data[self:size()+1] = obj
+	return self
+end
+
+function Stack:pop()
+	local result = self:getBack()
+	table.remove(self.data,self:size())
+	return result
+end
+
+function Stack:getBack()
+	if self:size() == 0 then error("stack is empty") end
+	local result = self.data[self:size()]
+	return result
+end
+
+function Stack:setBack(obj)
+	if self:size() == 0 then error("stack is empty") end
+	self.data[self:size()] = obj
+	return self
+end
+
+return Stack