Mex building from C++ DLL

Jasmin - 2020-12-07T11:12:22+00:00

Question: Mex building from C++ DLL

I have a C++ DLL and its header file. I'm trying to build a MEX function for each function in the DLL, and one of the functions has the following signature:   % // This is from the C++ header file int myFunc( const char * const Input1, SomeStructType * Output1, int & Output2); { ... } When I try to build a MEX in defining the inputs in my MATLAB workspace and then I run this command: myFuncReturnValue = coder.ceval('myFunc', coder.ref(Input1), coder.ref(Output1), ***???***) The error i get is: ...error C2664: 'int myFunc( const char * const Input1, SomeStructType * Output1, int & Output2)': cannot convert argument 3 from 'int16_t' to 'int &'...   I couldn't find any help defining 'int &' as a MATLAB datatype so i can't pass it into the MEX builder.

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Expert Answer

Kshitij Singh answered . 2025-11-20

int myFunc(int& out);

myFunc.cpp

 

#include "myFunc.hpp"

int myFunc(int& out)
{
    out = 2;
    return 5;
}

myFuncWrapper.hpp

 

#include "myFunc.hpp"

inline int myFuncWrapper(int* out) {
    return myFunc(*out);
};

callMyFuncWrapper.m

 

function y = callMyFuncWrapper  %#codegen
    y = int32(0);
    if coder.target('MATLAB')
        % Executing in MATLAB, call MATLAB equivalent of
        % C function myFuncWrapper
        y = int32(5 + 2);
    else
        % Executing in generated code, call C function myFuncWrapper
        coder.updateBuildInfo('addSourceFiles','myFunc.cpp');
        coder.cinclude('myFuncWrapper.hpp');
        in = int32(0);
        y = coder.ceval('myFuncWrapper', coder.ref(in));
        y = y + in;
    end
end

Call codegen

>> codegen callMyFuncWrapper -report -lang:c++

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