FIX: Failure To Call Destructor of Explicitly Constructed Anonymous Temporary

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Article ID: 216731 - View products that this article applies to.
This article was previously published under Q216731
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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.


Microsoft has confirmed that this is a bug in the Microsoft products that are 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:
194022 INFO: Visual Studio 6.0 Service Packs, What, Where, Why

194295 HOWTO: Tell That Visual Studio 6.0 Service Packs Are Installed


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;
The output is:
In CPtr::CPtr()
The output should be:
In CPtr::CPtr()
In CPtr::~CPtr()


Article ID: 216731 - Last Review: February 21, 2014 - Revision: 2.0
  • Microsoft Visual C++ 6.0 Enterprise Edition
  • Microsoft Visual C++ 6.0 Professional Edition
  • Microsoft Visual C++, 32-bit Learning Edition 6.0
kbnosurvey kbarchive kbbug kbfix kbvc600fix kbcpponly kbcompiler kbvs600sp3fix KB216731

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