57 lines
1.3 KiB
Forth
57 lines
1.3 KiB
Forth
The standard RETRO language provides `bi` and `tri` combinators
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to apply quotes to two or three values in various combinations.
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Sometimes it may be necessary to do this with four values.
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Note that this is *ugly* code. It's functional, but if you can
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refactor to avoid needing it, it'll likely be better in the long
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run.
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`quad` applies four quotes to a value. These are equivilent:
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#10 [ #1 + ] call
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#10 [ #1 - ] call
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#10 [ #2 + ] call
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#10 [ #3 + ] call
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#10 [ #1 + ] [ #1 - ] [ #2 + ] [ #3 + ] quad
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~~~
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:quad (xqqqq-)
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'abcde 'abacadae reorder
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push push push push push push
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call pop pop call pop pop call
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pop pop call ;
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~~~
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`quad*` takes eight values (!) and applies each quote to a
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specific value. E.g., these are equivilent:
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#10 [ #1 + ] call
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#11 [ #1 - ] call
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#12 [ #2 + ] call
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#13 [ #3 + ] call
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#10 #11 #12 #13 [ #1 + ] [ #1 - ] [ #2 + ] [ #3 + ] quad*
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~~~
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:quad* (abcdqqqq-)
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'abcdefgh 'aebfcgdh reorder
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push push push push push push
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call pop pop call pop pop call
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pop pop call ;
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~~~
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`quad@` takes four values and a quote, and applies the quote to
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each value in order. These are equivilent:
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#10 [ #1 + ] call
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#11 [ #1 + ] call
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#12 [ #1 + ] call
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#13 [ #1 + ] call
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#10 #11 #12 #13 [ #1 + ] quad@
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~~~
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:quad@ (abcdq-)
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'abcde 'abcdeeee reorder quad* ;
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~~~
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