Re: Single instance issue

From:

Abhishek Padmanabh <abhishek.padmanabh@gmail.com>

Newsgroups:

microsoft.public.vc.language

Date:

Sat, 22 Dec 2007 00:56:51 -0800 (PST)

Message-ID:

<5f5e8e8c-f5a8-4101-b54e-260287d2510c@s8g2000prg.googlegroups.com>

On Dec 22, 10:59 am, Sarath <CSar...@gmail.com> wrote:

On Dec 21, 6:22 pm, Norbert Unterberg <nunterb...@newsgroups.nospam>
wrote:

Sarath schrieb:

I've to write a single instance class. there are different methods to
control the single instance of a program

class CSingleton
{
public:
    CSingleton& GetInstance(){ static CSingleton s; return s; }

private:
    CSingleton(){}
    ~CSingleton(){}
}

The above code failed to compile in Visual C++ 6.0 but compiled in
Visual C++ 7.1 and Visual C++ Express 2008. CRT calling the destructor=

of the class. So that Visual C++ 6.0 compilation error is correct
according to the concept.

I also tried in Dev C++. It was successful but didn't call the dtor of=

the class. Which implementation is correct according to the standard.

You might want to have a look at the singleton class in one of the boost=

modules:

http://svn.boost.org/trac/boost/browser/trunk/boost/pool/detail/singl...

I find the implementation quite interesting.

Norbert- Hide quoted text -

- Show quoted text -

Sorry I can't use Boost. It's there are specific libraries approved
for my project. So it's difficult to add a new library support for
entire project.

You don't need the whole library. And I think you might not need to
build it just to use the singleton. Just including the header should
do the trick (and presence of other dependent headers). But as for
boost in general, I am not sure if they support VC6. They might not
be, in which case it is not worth it (if you don't migrate to a better
compiler).