Re: Singleton and static function

From:
Maxim Yegorushkin <maxim.yegorushkin@gmail.com>
Newsgroups:
comp.lang.c++
Date:
Fri, 31 Oct 2008 09:37:19 -0700 (PDT)
Message-ID:
<64cee6ab-12a5-4b62-88d4-b490975d87f5@c22g2000prc.googlegroups.com>
On Oct 31, 3:27 pm, John Doe <mos...@anonymous.org> wrote:

Hi,

I have a singleton class defined like this :

class UIManager : public CSingleton<UIManager>,
                                  publi=

c CObject

{
protected:
        DECLARE_DYNAMIC(UIManager)
        friend class CSingleton<UIManager>;

        UIManager();
        virtual ~UIManager();

public:
...

};


What do you need that CSingleton<> for? Can you not just have a global
object?

and I was using this code like this :

A)
UIManager* l_pUiMgr = UIManager::GetInstance();
ASSERT (l_pUiMgr != NULL);
l_pUiMgr->GetResText( a_ResId, bStripHtml);


That ASSERT is probably useless because if UIManager is allocated on
the heap (using new) it throws an exception. It it it allocated as a
function static variable, than it can never be NULL.

But I was fed up with always typing this so I have declared below my
UIManager class a static function :

static inline UIManager& UIManager() { return *(UIManager::GetInstance())=

; }

and I wanted to be able to call it like that :

UIManager().GetResText( a_ResId, bStripHtml);


Which looks better.

The problem is I get some compilations errors with the code in A)

5>c:\wce_v42\inc\BaseView.h(227) : error C2065: 'l_pUiMgr' : undeclared
identifier

Why I cannot write UIManager* now ?


This error says that you are accessing l_pUiMgr object, which is not
available from the current scope. Either you misspelled it or did not
include the necessary header files.

--
Max

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