Buses as inputs/outputs in C MEX S-Functions and vectors as structure members

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N P 2012-8-24

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https://ww2.mathworks.cn/matlabcentral/answers/46652-buses-as-inputs-outputs-in-c-mex-s-functions-and-vectors-as-structure-members

Hi everybody,

I need help, I've already learned how to define buses as outputs/inputs of a c-mex functions with the legacy code tool but what I need now is that my structures which are actually the buses have vectors as members. Something like :

typedef struct sTestData {

std::vector<Type_A> member1;
std::vector<Type_B> member2;
} TestData_t;

when I try to generate the code for the c-mex function and compile it I receive several errors :

error C2039: '..': is not a member of 'std::vector<_Ty>' with [ _Ty=Type_A ]

I hope someone can help me.

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Answer 1

Kaustubha Govind 2012-8-24

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https://ww2.mathworks.cn/matlabcentral/answers/46652-buses-as-inputs-outputs-in-c-mex-s-functions-and-vectors-as-structure-members#answer_57059

First, std::vector is a C++ data structure, so you can't use them inside C S-functions, you'll need to use C++ S-functions. Second, Simulink does not support dynamic allocation, so data structures like std::vectors are not allowed. You might need to convert your std::vectors to built-in arrays (which is fairly easy using an intermediate type and extracting the built-in array under the std::vector using &member1[0]) of fixed-size (or of a fixed maximum size at any rate if you plan to create a bus containing variable-size signals).