Get matrix size from a pointer- MEX

Question

I read the second variable in C++

#define D prhs[1]

double* d = mxGetPr(D); // get the pointer

Now I want to get the size of D

int mySize = mxGetM(D);

cool...Now how can I get the size from the pointer d (not D)?

int mySize = mxGetM((const mxArray) d); // does not work

Thanks

Answer 1

I guess it's not possible to find the size of an array given its pointer and mex.h also cannot do that.