Call C++ class from Matlab

Is it possible to call C++ classes from Matlab? When I use loadlibrary to load a DLL into Matlab, I get the following errors:

Warning: The data type 'error' used by function CLASSNAME does not exist. 
> In loadlibrary at 421
Warning: The function 'CLASSNAME' was not found in the library 
> In loadlibrary at 421

Would creating a MEX file be any different than using loadlibrary?

Answer 1

[Walter Roberson]

Only functions which are

extern "C"

can be called from MATLAB. Those routines have no "this", so only static class methods can be directly called. Those routines can create new objects or reference existing objects, but you cannot pass objects in from MATLAB and cannot return objects to MATLAB.

Answer 2

[Vivek]

We've introduced this capability in MATLAB starting in R2019a. Please take a look:

Integrate C++ libraries with MATLAB

Documentation

Blog Post

Answer 3

[HANS]

Hi to all :)

I have name.mex function and many .cpp and .h files related to it. name.mex takes only 1xinf vector which is a complex double values inside and output is the same size vector.

I want to call this name.mex within C++. As I know I have to use "int mexCallMATLAB(int nlhs, mxArray *plhs[], int nrhs, mxArray *prhs[], const char *command_name);"

Please could anybody give a usage example in C++ ? I guess I have to use "ifstream" to load the data vector before I use the function but do I have to define via "mxArray" or ??

Thx, WR