13 lines
269 B
Forth
13 lines
269 B
Forth
: checked-array
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CREATE ( size -- ) DUP , CELLS ALLOT
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DOES> ( i -- a+i )
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2DUP @ 0 SWAP WITHIN IF
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SWAP 1+ CELLS +
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ELSE
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1 THROW
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THEN ;
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8 checked-array myarray
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: safe-access ( i -- a[i] )
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['] myarray CATCH 1 = IF ." Out of bounds!" 0 THEN ;
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