使用返回枚举的函数的问题

Question

我正在尝试创建一个返回枚举的函数。该函数接受一个字符串。使用算法库来小写字符串，然后使用if语句来检查它的枚举时间。

枚举定义为：

 enum Location {Abs, Front, Back, Trap};

我收到以下警告：

     warning: variable 'enum_location' is used uninitialized whenever
  'if' condition is false [-Wsometimes-uninitialized]
    if(location_string == "abs")

以下是功能：

  milestone::Location Task::convert_to_enum(std::string location_string)
  {
    std::transform(location_string.begin(), location_string.end(), location_string.begin(), ::tolower);

    milestone::Location enum_location;

    if(location_string == "trap")
    {
      enum_location = milestone::Trap;
    }
    else if (location_string == "back")
      {
        enum_location = milestone::Back;
      }
      else if(location_string == "front")
      {
        enum_location = milestone::Front;
      }
      else if(location_string == "abs")
        {
          enum_location = milestone::Abs;
        }

    return enum_location;
  }