c++ - How do I check if System::Collections::ArrayList exists / is empty -

i'm trying access handle ::collections::arraylist 2 simple accessor/mutator functions:

/** --------------------------------------------  * public accessor rx message queue  * --------------------------------------------- */ system::collections::arraylist^ peak_lib::rx_queue(void) {     return this->m_queue_mes_rx; } /** --------------------------------------------  * public mutator rx message queue  * --------------------------------------------- */ void peak_lib::rx_queue( system::collections::arraylist^ inlist ) { if ( inlist->count != 0 ) // <-- error line {     this->m_queue_mes_rx = inlist; } } 

my compiler throws an unhandled exception of type 'system.nullreferenceexception' occurred in my.exe , adds reference not called on object ( or along these lines, have translate polish :/ ) when try access ->count property ( see error line in code ) told me here check if inlist variable exists.

what's right (or @ least better :d) way check if arraylist exists when i'm using c++/cli visual studio 2008?

initially, check null before checking count

if (inlist != nullptr) {      if(inlist->count)      {} }