Metaprogramming: Difference between revisions
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{{libheader|initlib}} |
{{libheader|initlib}} |
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<lang postscript> |
<lang postscript> |
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/ift { |
/ift { |
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4 dict begin |
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[/.if /.then] let* |
[/.if /.then] let* |
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count array astore /.stack exch def |
count array astore /.stack exch def |
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>| 2 dup 1 gt {=} ift |
>| 2 dup 1 gt {=} ift |
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2 |
2 |
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</lang> |
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Note that even the let expression was implemented using meta programming |
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<lang postscript> |
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/let* {reverse {exch def} forall}. |
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</lang> |
</lang> |
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