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Determine if C++ object is null
tf = clibIsNull(cppObj)
tf = clibIsNull(cppObj) returns logical 1 (true) if cppObj is nullptr. Otherwise, it returns logical 0 (false).
cppObj
1
true
nullptr
0
false
example
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Suppose that you create an interface to library nullptr, built from this nullptr.hpp header file, containing a function that returns NULL.
nullptr.hpp
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.
A
ret = clib.nullptr.returnObjectNullptr
ret = null A
Test for nullptr.
if clibIsNull(ret) % Code to process nullptr end;
C++ object created in MATLAB, specified as a handle
Introduced in R2019b
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