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Suppose you want to write a function which returns sqrt(r^2-x^2), with some of the nice features of the abs function, to be called rtleg for “right triangle leg”. Your first option is to simply write an interpreted function:
func rtleg(r,x,..)
{
rr = 1./r;
x *= rr; /* prevent overflow for very large or small r */
y = 1. - x*x;
while (!is_void((x=next_arg()))) { x *= rr; y -= x*x; }
return r*sqrt(y);
}
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This interpreted function is likely the best solution, because the required function is simple and vectorizes naturally. For the sake of argument, however, suppose that you wanted to create a compiled version of rtleg instead. Now you need not only interpreted code, in a file ‘rtleg.i’, but also compiled code in a file ‘rtleg.c’. Let’s consider two cases: First, let’s use the PROTOTYPE comment and let codger generate the required wrapper code. Second, let’s write the wrapper code using ‘yapi.h’ directly.
| • Using PROTOTYPE | Example of PROTOTYPE comment. | |
| • Using yapi.h | Example of ‘yapi.h’ API. |
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