duktape-1.8.0/src-separate/duk_hnativefunction.h

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/*
 *  Heap native function representation.
 */
 
#ifndef DUK_HNATIVEFUNCTION_H_INCLUDED
#define DUK_HNATIVEFUNCTION_H_INCLUDED
 
#define DUK_HNATIVEFUNCTION_NARGS_VARARGS  ((duk_int16_t) -1)
#define DUK_HNATIVEFUNCTION_NARGS_MAX      ((duk_int16_t) 0x7fff)
 
struct duk_hnativefunction {
    /* shared object part */
    duk_hobject obj;
 
    duk_c_function func;
    duk_int16_t nargs;
    duk_int16_t magic;
 
    /* The 'magic' field allows an opaque 16-bit field to be accessed by the
     * Duktape/C function.  This allows, for instance, the same native function
     * to be used for a set of very similar functions, with the 'magic' field
     * providing the necessary non-argument flags / values to guide the behavior
     * of the native function.  The value is signed on purpose: it is easier to
     * convert a signed value to unsigned (simply AND with 0xffff) than vice
     * versa.
     *
     * Note: cannot place nargs/magic into the heaphdr flags, because
     * duk_hobject takes almost all flags already (and needs the spare).
     */
};
 
#endif  /* DUK_HNATIVEFUNCTION_H_INCLUDED */