try catch

转载于 2013-03-15 02:39:38 发布 · 456 阅读

本文提供了一个C++示例代码，演示了如何通过try-catch-throw机制管理动态分配的内存，确保即使在异常发生时也能正确释放资源。

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a simple example:

class CTest1;
 class CTest2;
 class CTest3;
 
void BadCode()
 {
   //define
   CTest1 * pTest1 = NULL;
   CTest2 * pTest2 = NULL;
   CTest3 * pTest3 = NULL;
 
  //使用try, catch, throw
   try
   {
     //new test1
     pTest1 = new CTest1;
 
    //do something
     bool bRet = DoSomething();
     if (!bRet)
       throw -1;
 
    //new CTest2
     pTest2 = new CTest2;
 
    //do something
     bRet = DoSomething();
     if (!bRet)
       throw -2;
 
    //new CTest3
     pTest3 = new CTest3;
 
    bRet = DoSomething();
     //do something
     if (!bRet)
       throw -3;
 
    //release
     delete pTest1;
     pTest1 = NULL;
     delete pTest2;
     pTest2 = NULL;
     delete pTest3;
     pTest3 = NULL;
   }
   catch(...)
   {
     if (pTest1)
       delete pTest1;
     if (pTest2)
       delete pTest2;
     if (pTest3)
       delete pTest3;
   }
 }