MATLAB: How to pass a string from a C++ Mex file to the MATLAB workspace

cc/c++c++ implementationconversiondata typeMATLABmexmex filemx

I am trying to pass a string from a C++ Mex file I am working on to the MATLAB workspace for plotting purposes. It is a fairly complicated program, but all I want to do is pass a std::string in my MexFunction (which I defined as "var") to the MATLAB workspace. This is the important part of the code:
#include "mex.hpp"
#include "mexAdapter.hpp"
using namespace matlab::data;
using namespace matlab::engine;
using namespace std;
using matlab::mex::ArgumentList;
// "some code here" //
class MexFunction : public matlab::mex::Function{
public:
    void operator()(ArgumentList outputs, ArgumentList inputs){
        std::shared_ptr<matlab::engine::MATLABEngine> matlabPtr = getEngine();
        ArrayFactory factory;
        
        // "more code here" //
        
        for(int i = 0; i < 100; i++){
            std::vector<ToolData> toolData =  apiSupportsBX2 ? capi.getTrackingDataBX2() : capi.getTrackingDataBX();
            for (int i = 0; i < toolData.size(); i++)
            {
                std::string var = toolDataToCSV(toolData[i]);
                
                std::cout << var << std::endl;
                
                // Pass "var" to MATLAB here //
            }
            usleep(5000);
        }
        
        matlabPtr->eval(u"printData = true");        
        
        // "more code here" //
        std::cout << "Press Enter to continue...";
        std::cin.ignore();
    }
};
I'm fairly new to C++/MATLAB-implementations and don't have that much experience with Mex file programming, so thanks in advance!

Best Answer

matlab:engine::setvariable seems to be the function to do that. With your original C++ code (not the C interface)
matlabPtr->setVariable(u"variablename", var);  //%don't use var as variable name in matlab. It's the variance function.
Untested. I've never used the C++ interface.
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