switch語句case內聲明對象

今天本來想使用switch語句來實現不同情況下執行相對應的代碼，在每個case內都需要聲明不同的類的對象，結果出現

switch(work_state_ptr->cutter_type)
	{
	case 1:
		
			boost::shared_ptr<ocl::CylCutter>  cutter1(new ocl::CylCutter(work_state_ptr->cutter_diameter,work_state_ptr->cutter_Lc));
	                GeneratePathforCutter(*(cutter1.get()),stl_sf);
			break;
		
	case 2:
		
			boost::shared_ptr<ocl::BallCutter> cutter2(new ocl::BallCutter(work_state_ptr->cutter_diameter,work_state_ptr->cutter_Lc));
			GeneratePathforCutter(*(cutter2.get()),stl_sf);
			break;
		
	case 3:
		
                        boost::shared_ptr<ocl::BullCutter> cutter3(new ocl::BullCutter(work_state_ptr->cutter_diameter, work_state_ptr->cutter_radius,work_state_ptr->cutter_Lc));
			GeneratePathforCutter(*(cutter3.get()),stl_sf);
			break;
		
	case 4:
		
			boost::shared_ptr<ocl::ConeCutter> cutter4(new ocl::ConeCutter(work_state_ptr->cutter_diameter,work_state_ptr->cutter_B1,work_state_ptr->cutter_Lc));
			GeneratePathforCutter(*(cutter4.get()),stl_sf);
			break;
		
	default:
		break;
	}

錯誤：error C2360: “cutter1”的初始化操作由“case”標籤跳過

分析原因：在case 可能沒有被執行到時，對象就沒有相應的初始化導致。

解決方法是：在每個case裏面都加入大括號“{ }”，使每個對象都成爲局部變量。

即：

switch(work_state_ptr->cutter_type)
	{
	case 1:
		{
		       boost::shared_ptr<ocl::CylCutter>  cutter1(new ocl::CylCutter(work_state_ptr->cutter_diamet                        er,work_state_ptr->cutter_Lc));
	        GeneratePathforCutter(*(cutter1.get()),stl_sf);
			break;
		}
	case 2:
		{
			boost::shared_ptr<ocl::BallCutter> cutter2(new ocl::BallCutter(work_state_ptr->cutter_diameter,work_state_ptr->cutter_Lc));
			GeneratePathforCutter(*(cutter2.get()),stl_sf);
			break;
		}
	case 3:
		{
			boost::shared_ptr<ocl::BullCutter> cutter3(new ocl::BullCutter(work_state_ptr->cutter_diameter,work_state_ptr->cutter_radius,work_state_ptr->cutter_Lc));
			GeneratePathforCutter(*(cutter3.get()),stl_sf);
			break;
		}
	case 4:
		{
			boost::shared_ptr<ocl::ConeCutter> cutter4(new ocl::ConeCutter(work_state_ptr->cutter_diameter,work_state_ptr->cutter_B1,work_state_ptr->cutter_Lc));
			GeneratePathforCutter(*(cutter4.get()),stl_sf);
			break;
		}
	default:
		break;
	}