class A {
public:
    double val;
};

// Function returning nullptr object
A* returnObjectNullptr() {
    return nullptr;
}

Display nullptr for an object of class A. The MATLAB^® code is used as an illustration and does not execute as is, unless you build the interface.

ret = clib.nullptr.returnObjectNullptr

ret = 
    null A

Test for nullptr.

if clibIsNull(ret) 
% Code to process nullptr
end;