自定义异常处理类的写法和使用（Write and use custom exception handling classes）.docVIP

自定义异常处理类的写法和使用（Write and use custom exception handling classes） See the CSubwayException class written by yourself: [note]: / / specified in the C++ standard, can be anywhere in the program throw an exception object, / / does not necessarily only in scope by try block monitoring and protection in order to throw an exception, but / / if appeared in the program to find the exception object thrown out of the corresponding catch block, C++ / / quasi requirements (terminate) system must perform to terminate the program. This routine is / / you can compile, but running will abort. This tends to give software / / system brings insecurity. By contrast, the exception handling model provided in Java is not Such a permanent / / Xu can not find the exception object corresponding to the catch block, it will give an error at compile time / / so tips, exception handling model provided by Java C++ to more often than perfect, the following chapters / / will further on the two kinds of exception handling model for a detailed analysis and comparison. Return 0; The meaning of try, catch, throw is clear, but how to use it, it took me many years to understand Lets look at a bad example C/C++ code //----------------- bad code class CTest1 class developing; CTest2; class CTest3; void BadCode (//new test1) {CTest1 pTest1 = New * CTest1; //do something bool = DoSomething (bRet); if (! BRet) {delete pTest1; return //new CTest2;} CTest2 * pTest2 = new CTest2; //do something bRet = DoSomething (); if (! BRet) {delete pTest1; delete pTest2; return //new CTest3;} CTest3 * pTest3 = new CTest3; //do something = DoSomething (bRet); if (! BRet) {delete pTest1; delete pTest2; delete pTest3; return //release;} delete pTest1; delete pTest2; delete pTest3;} Here is my personal preference C/C++ code //--------- good example - class CTest1; class CTest2; class CTest3; void MyCode (//define) {CTest1 = NULL * pTest1 * pTest2; CTest2 = NULL; pTest3 = CTest3 * NULL; / / try, catch, throw try test1 pTest1 CTest