FIX: Failure To Call Destructor of Explicitly Constructed Anonymous Temporary

• Microsoft Visual C++, 32-bit Editions, version 6.0

SYMPTOMS

When an explicitly constructed anonymous temporary of template type that has a default constructor with a default argument is used in an expression, it is never destroyed.

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article.

This bug was corrected in Visual Studio 6.0 Service Pack 3. For more information about Visual Studio service packs, please see the following articles in the Microsoft Knowledge Base:

Q194022 INFO: Visual Studio 6.0 Service Packs, What, Where, Why

Q194295 HOWTO: Tell That Visual Studio 6.0 Service Packs Are Installed

MORE INFORMATION

Sample Code

#include <stdio.h>
const int ex = 4;

template<typename T>
struct CPtr {
    CPtr(int e = ex) {
		m_ptr = new T();
		printf("In CPtr::CPtr()\n");
	}

    T *operator->() const {
		return m_ptr;
	}

	~CPtr() {
		printf("In CPtr::~CPtr()\n");
	}

	T *m_ptr;
};

struct I {
	int mf() {return 1;}
};

int main()
{
	bool fFlag = false;
	if ((CPtr<I>()->mf() < 0) && !fFlag) return 1;
	return 0;
} 

In CPtr::CPtr() 

In CPtr::CPtr()
In CPtr::~CPtr() 

Additional query words:

Keywords          : kbservicepack kbCompiler kbCPPonly kbVC600bug kbVC600fix kbVS600sp2 kbVS600SP1 kbVS600sp3fix 
Version           : winnt:6.0
Platform          : winnt 
Issue type        : kbbug 

Last Reviewed: May 19, 1999