Is it necessary to use singleton pattern?

Hello All,

i am currently developing a wrapper library, which is suppose to
provide call backs to
application developers with events of different category.

my thought is.. use a singleton class and hold user registered
call-back derived class object
and call the object when-ever i get events.

Now to just hold a call-back object pointer do i need a singleton
class instance?.

Is there better approach?.

my thoughts look something like:

class baseCB
{
public:
virtual event1(const msg1 &msg);
virtual event2(const msg2 &msg);
};

class wrapper
{
static wrapperInstance() { return s_wrapperInstance; }
static initialize(baseCB *pCB) { s_wrapperInstance = new wrapper(pCB);
baseCB *callback() { return m_cb; }
private:
explit wrapper(baseCB *pCB):m_cb(pCB){}
baseCB *m_cb;
};

in the place where i get events i want to do something like:

wrapperInstance()->callback()->event1(&msg);

-thanks
Harish

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