CompuServe Thread

KC> Please show me a way to handle errors inside KC> a constructor. A constructor does not return KC> a value. It cannot return a NULL or FALSE KC> to the parent program that the constructor KC> encounters an error. About your only choice is to throw an exception. Unfortunately, until VC++ 2.0 is released, Microsoft's "pseudo" exception mechanism — really just Windows' version of setjmp()/longjmp() calls wrapped in macros — can cause problems of its own because it doesn't unwind the stack. This means that the destructors of objects declared on the stack don't get called which can result in memory leaks (or worse). gc Norman, Oklahoma USA — "Is that a *real* poncho or is that a *Sears* poncho?"

Kwong-hip, >Please show me a way to handle errors inside a constructor. Until VC++ comes out with real exception handling, you have two options. 1. Add a flag to the class' members, and have the ctor set the flag to indicate success or failure. Then the calling function can check to see if the construction was successful. 2. Only do safe operations in the ctor, and add an Init function to the class which must be called by the calling function after the ctor is called. This function can return a value indicating success or failure. Michael Meadows