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Category:Fexl: Difference between revisions
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Ultimately the core functions of Fexl are written in the [[C]] programming language. To write a new core function named "X" within Fexl, you simply create an appropriate C routine named "fexl_X". It automatically becomes available as a built-in Fexl function.
For example, here is the C routine which implements the classic '''S''' combinator (fusion), where (S x y z) = (x z) (y z):
<lang C>
value fexl_S(value f)
{
if (!f->L->L || !f->L->L->L) return f;
return A( A(f->L->L->R, f->R), A(f->L->R, f->R) );
}
</lang>
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