Error with C++ Mex (Linux) in MatlabDataArray/VariableInfo.hpp

Question

Amit Maoz 2021-10-14

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1563601-error-with-c-mex-linux-in-matlabdataarray-variableinfo-hpp

回答： Neha 2024-5-10

Hello,

I'm trying to compile a C++ Mex file in Linux + CMake, with Matlab 2020b.

I've followed your guide and included mexAdapter.hpp.

I get this error error: /usr/local/MATLAB/R2020b/extern/include/MatlabDataArray/VariableInfo.hpp(137): error #858: type qualifier on return type is meaningless:

typedef const void(*SymbolInfoSetValueFcnPtr)(detail::RefCounted*, size_t, impl::ArrayImpl*);

Can't compile due to that. Any idea how to fix this?

Thanks,

Amit

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Answer 1

Neha 2024-5-10

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https://ww2.mathworks.cn/matlabcentral/answers/1563601-error-with-c-mex-linux-in-matlabdataarray-variableinfo-hpp#answer_1455556

Hi Amit,

The error message "error #858: type qualifier on return type is meaningless" points out that applying a type qualifier like const to the return type of a function pointer is not meaningful. In the context of your typedef declaration, the issue arises from trying to make the return type of the function pointer const void. Non-class rvalues (like primitives returned by functions) cannot be modified, so they inherently behave as if they are const, even without being explicitly declared as such.

Hope it helps!