Re: Another debugger question

From:

"Daniel T." <daniel_t@earthlink.net>

Newsgroups:

comp.lang.c++

Date:

Sun, 04 Apr 2010 10:54:11 -0400

Message-ID:

<daniel_t-BE6532.10541104042010@70-3-168-216.pools.spcsdns.net>

JoeC <enki034@yahoo.com> wrote:

What does this mean and how can I use it to track down a bug?

The below is the operator delete function. If one if its asserts is
firing, probably either you are trying to delete something that wasn't
newed, or you are trying to delete something twice.

*void operator delete() - delete a block in the debug heap
*
*Purpose:
* Deletes any type of block.
*
*Entry:
* void *pUserData - pointer to a (user portion) of memory block
in the
* debug heap
*
*Return:
* <void>
*

*dbgnew.cpp - defines C++ scalar delete routine, debug version

void operator delete(
        void *pUserData
        )
{
        _CrtMemBlockHeader * pHead;

        RTCCALLBACK(_RTC_Free_hook, (pUserData, 0));

        if (pUserData == NULL)
            return;

        _mlock(_HEAP_LOCK); /* block other threads */
        __TRY

            /* get a pointer to memory block header */
            pHead = pHdr(pUserData);

             /* verify block type */
            _ASSERTE(_BLOCK_TYPE_IS_VALID(pHead->nBlockUse));

            _free_dbg( pUserData, pHead->nBlockUse );

        __FINALLY
            _munlock(_HEAP_LOCK); /* release other threads */
        __END_TRY_FINALLY

        return;
}

#endif /* _DEBUG */