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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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Task/Extend-your-language/TXR/extend-your-language.txr Normal file
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(defmacro if2 (cond1 cond2 both first second . neither)
(let ((res1 (gensym))
(res2 (gensym)))
^(let ((,res1 ,cond1)
(,res2 ,cond2))
(cond ((and ,res1 ,res2) ,both)
(,res1 ,first)
(,res2 ,second)
(t ,*neither)))))