C++ Address-of nullchecking

Impl& impl;

That little motherfucking line of code in a header is pissing me off.  Why?  Because it eventually causes an access violation at the line:

if(!impl.mProcessTimer.checkExpirationAndReset(SECS_BETWEEN_PROCESS))

And I have no idea how to check for nulls in an address-of situation.  Regular pointers?  Sure, but whenever I try if(!impl) or some other more convoluted variation of that, MSVC screams about invalid operators. 

Halp plz.

>>20,25,26

Old Infected Mushroom is definitely psytrance — that is, everything before ``IM the Supervisor'' (or ``Converting Vegetarians'' disc 2 if you want to be a bit more pessimistic). Nowadays they seem to be trying to make psychedelic pop.

Sincerely,
Someone who was listening to goa and psychedelic trance years before you fags found it on the internet