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Internal Interface Functions

5-15

mlfVF Interface Function

The Compiler produces this interface function only when the M-function uses

the variable

nargout and has at least one output. This void interface function

specifies zero output arguments to the implementation version of the function,

and in the event that the implementation version still returns an output

(which, in MATLAB, would be assigned to the

ans variable), it deallocates the

output.

This is the corresponding

mlfVF interface function (mlfVFoo) for the foo.m

example described at the beginning of this section. This function calls the C

Mfoo implementation function that appears in foo.c:

* The function "mlfVFoo" contains the void interface for

* the "foo" M-function from file

* "<matlab>\extern\examples\compiler\foo.m" (lines 1-8). The

* void interface is only produced if the M-function uses

* the special variable "nargout", and has at least one

* output. The void interface function specifies zero

* output arguments to the implementation version of the

* function, and in the event that the implementation

* version still returns an output (which, in MATLAB, would

* be assigned to the "ans" variable), it deallocates the

* output. This function processes any input arguments and

* passes them to the implementation version of the

* function, appearing above.

void mlfVFoo(mxArray * x, mxArray * y) {

/* ------------- Input Argument Processing ------------ */

mxArray * a = NULL;

mxArray * b = NULL;

mlfEnterNewContext(0, 2, x, y);

/* ----------------- Call M-Function ------------------ */

a = Mfoo(&b, 0, x, y);

/* ------------- Output Argument Processing ----------- */

mlfRestorePreviousContext(0, 2, x, y);

mxDestroyArray(a);

mxDestroyArray(b);

}

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MATLAB APPLICATION DEPLOYMENT - WEB EXAMPLE GUIDE Guida Utente Pagina 141