Hi Tamir,
Unfortunately, calling a C++ function that has a reference parameter in its signature is not supported in MATLAB Coder as of MATLAB R2020b. We've made an internal note of your request so we can look at lifting that limitation in the future. Meanwhile, as a workaround, the best you can do is to create a wrapper C++ function that takes a pointer, which in turn calls the function that takes the reference, as I've shown in the following simple example:
myFunc.hpp
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++
Hope this helps!
