Re: iword and sword problem

From:

"kanze" <kanze@gabi-soft.fr>

Newsgroups:

comp.lang.c++.moderated

Date:

6 Sep 2006 13:50:36 -0400

Message-ID:

<1157552038.481268.22040@m79g2000cwm.googlegroups.com>

Erik wrote:

kanze schrieb:

Bo Persson wrote:

"Erik" <erik.griessmann@fmc-ag.com> skrev i meddelandet
news:1154496683.625736.118250@b28g2000cwb.googlegroups.com...

I used the static ios_base functions iword and sword in a
DLL-Library-Code to implement a manipulator. My Visual
C++ 8 compiler always complains about a memory leak, when
the program is terminated. Is this a compiler specific
problem?

Could be.

The leak detector is run at the end of main(), well before
global objects are destroyed.

That depends on the leak detector. Note, too, that cin,
cout and cerr are never destructed. If he has used his
manipulator on one of these, the memory it causes to be
allocated will never be freed. Some leak detectors might
complain here, too, regardless of how late they run. (It
depends on the sophistication of the leak detector; a good
leak detector will recognize that there are still pointers
to the memory in static objects, and only warn that there
might be a leak.)

iword and pword are member functions of the class ios_base.

And they allocate object specific memory. Which is guaranteed
to exist for the lifetime of the object, and so must be freed in
the destructor.

Thus the problem shouldn't have smth. to do with cout, cin,
cerr.

cout, cin and cerr are of a type which derives from ios_base.
If their destructors are never called, then any memory allocated
by iword and pword for them will never be freed.

--
James Kanze GABI Software
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