28 lines
487 B
Forth
28 lines
487 B
Forth
Marker provides a way to quickly reset the dictionary and heap
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to the state it was in prior to the creation of the marker.
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## The Code
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~~~
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:class:marker (a-)
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compiling? [ compile:lit &class:marker compile:call ]
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[ fetch-next !Dictionary fetch !Heap ] choose ;
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:marker (s-) [ @Heap @Dictionary ] dip d:create , , &class:marker reclass ;
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~~~
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## A Test Case
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```
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:a #1 #2 #3 ;
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:b a + + ;
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:c b n:put nl ;
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c
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'd marker
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:a #4 #5 #6 ;
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:b a + + ;
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:c b n:put nl ;
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c
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d
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c
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```
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