如何避免条件的限制 [英] How to avoid banches of if conditions

问题描述

我有一张填充的地图，我需要根据键重新排列。这样的重新安排需要很多如果的条件，我觉得很难看。



请告诉我任何更好的建议。



谢谢



我尝试过：

I've got a filled map, which I need to rearrange according key. Such rearranging requires a lot of 'if' condition, which i found quite ugly.

please advise me any better suggestion.

thanks

What I have tried:

for (auto it = inventory_data.begin(); it != inventory_data.end(); it++){
      if(it->first == "device_model"){
        hardware_info.set ("model", it->second);
      }
      if (it->first == "device_serial"){
        hardware_info.set ("serialNumber", it->second);
      }
      if (it->first == "device_revision"){
        hardware_info.set ("revision", it->second);
      }
      if (it->first == "imei_number"){
        mobile_info.set ("imei", it->second);
      }
      if (it->first == "mobile_cellId"){
        mobile_info.set ("cellId", it->second);
      }
      if (it->first == "mobile_iccid"){
        mobile_info.set ("iccid", it->second);
      }
      if (it->first == "msisdn"){
        mobile_info.set ("msisdn", it->second);
      }
      if (it->first == "imsi"){
        mobile_info.set ("imsi", it->second);
      }
      if (it->first == "mcc"){
        mobile_info.set ("mcc", it->second);
      }
      if (it->first == "mnc"){
        mobile_info.set ("mnc", it->second);
      }
      if (it->first == "lac"){
        mobile_info.set ("lac", it->second);
      }
    }

推荐答案

使用switch而不是if。当你有多个条件并且你也知道结果时它是更好的解决方案

use switch instead of if . it is better solution when you have multiple condition and you know result as well

一个替代方案可能是使用 map ，有字符串as 键值和struct（包含要调用的方法和方法参数）为映射值。

An alternative could be using a map, having the string as key value and a struct (containing the method to call and the method argument) as mapped value.

如何使用a字典来解决这个问题？然后你的整个循环减少到1行，未来的扩展变得非常简单（并且防错）。

How about using a dictionary to resolve this? Your whole loop is then reduced to 1 line, and future extensions become very easy (and error-proof).

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