Calling external (C++) static methods

coder.ceval(fcn,arg1,arg2)

can be used to call external c functions from autocode generated by Matlab Coder.

Is there a way to call an external class's static method using ceval call an external class's static method?

The goal here is to generate compilable autocode (not code that will actually be run from matlab) -- so I just need matlab to emit the import and ClassName::MethodName(arg1, arg2) etc. Does fcn accept ClassName::MethodName type symantics?

Answer 1

[Jon]

Well, I went ahead and just tried it -- and as it turns out, matlab will generate code that uses a namespace or class, as long as you include the header containing the declaration, and have the TargetLang set to C++

coder.cinclude('ExternalHeader.hpp');
coder.ceval('ExternalClass::staticMethod',arg1,arg2);

Answer 2

[Varun]

Hi Jon,

I understand that you want to use “coder.ceval” call an external class's static method. The “coder.ceval” function in MATLAB Coder is primarily designed to call external C functions. It doesn't directly support calling external C++ class methods, including static methods.

However, you can achieve the desired functionality by creating a wrapper C function that calls the C++ class method and then calling that wrapper function using coder.ceval.

Here's a general outline of the steps:

Create a C++ wrapper function that calls the static method of the external class:

// WrapperFunction.cpp
#include "ExternalClass.h"

extern "C" void callStaticMethodWrapper(int arg1, int arg2) {
    ExternalClass::staticMethod(arg1, arg2);
}

In MATLAB, use "coder.ceval" to call the wrapper function:

% MATLAB script
coder.ceval('callStaticMethodWrapper', arg1, arg2);

Please refer the following documentation to learn more about using "coder.ceval":

https://www.mathworks.com/help/simulink/slref/coder.ceval.html

Hope this helps.

[Jon]

Thanks. As it turns out, matlab will happily generate code that uses a namespace or class, as long as you include the header containing the declaration, and have the TargetLang set to C++

coder.cinclude('ExternalHeader.hpp');
coder.ceval('ExternalClass::staticMethod',arg1,arg2);