Type Alias DgemmFnPtr 

pub type DgemmFnPtr = unsafe extern "C" fn(transa: *const c_char, transb: *const c_char, m: *const c_int, n: *const c_int, k: *const c_int, alpha: *const c_double, a: *const c_double, lda: *const c_int, b: *const c_double, ldb: *const c_int, beta: *const c_double, c: *mut c_double, ldc: *const c_int);

BLAS dgemm function pointer type (LP64: 32-bit integers)

Signature matches Fortran BLAS dgemm:

void dgemm_(char *transa, char *transb, int *m, int *n, int *k,
            double *alpha, double *a, int *lda, double *b, int *ldb,
            double *beta, double *c, int *ldc);

Note: All parameters are passed by reference (pointers). Transpose options: ‘N’ (no transpose), ‘T’ (transpose), ‘C’ (conjugate transpose).