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Custom Node Pins

Is there a way to test if a pin has a connection to it using c++? Example:



void TestFunction(int a, int& b)
{

//if connected
b = a;

//not connected 

b = 5;

}


I could use if(a == 0) {} but a could possibly have a valid value of 0 and I wouldn’t want it changed if the pin is connected to something passing it 0.