Summary of Exception

0. Stack unwinding.When an exception is thrown and control passes from a try block to a handler, the C++ run time calls destructors for all automatic objects constructed since the beginning of the try block. This process is called stack unwinding.

Two notes: 1) local objects will be destructed in reverse order; 2) if another exception thrown during stack unwinding in destructing an object, as no one can handle that exception, Terminate will be called to end the program. 

View Code

class BB
{
public:    
    BB() {  OutputDebugString(_T("BB::BB()\n")); }
    virtual ~BB() {  OutputDebugString(_T("BB::~BB()\n")); throw 0; }
};

class DD : public BB
{
public:
    DD() {  OutputDebugString(_T("DD::DD()\n")); }
    ~DD() {  OutputDebugString(_T("DD::~DD()\n")); }
};

class EE
{
public:
    EE() { OutputDebugString(_T("EE::EE\n")); }
    ~EE() { OutputDebugString(_T("EE::~EE\n"));}
};

class FF
{
public:
    FF() { OutputDebugString(_T("FF::FF\n")); }
    ~FF() { OutputDebugString(_T("FF::~FF\n")); /*throw 1;*/}
};

int _tmain(int argc, _TCHAR* argv[])
{    
    try
    {
        FF ff;
        EE ee;
        BB* pBB = new DD();
        delete pBB;
    }    
    catch (...)
    {
        OutputDebugString(_T("---get exception caught.\n"));
    }

    return 0;
}

Output:

FF::FF
EE::EE
BB::BB()
DD::DD()
DD::~DD()
BB::~BB()
First-chance exception at 0x76d8b727 (KernelBase.dll) in effPractice.exe: Microsoft C++ exception: int at memory location 0x0045f784..
EE::~EE
FF::~FF
---get exception caught.