ALGOL 68/prelude: Difference between revisions
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=== aArrayBase.a68 ===
The MODEs for associative arrays. The AAKEY and AAVALUE MODEs must be defined as required.
<br>An item "init element value" must also be defined.
<br>If AAKEY is not STRING, a suitable HASH operator will also need to be defined.
<lang algol68># associative array handling using hashing #
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# find the element in the list, if it is there #
BOOL found element := FALSE;
INT ec := 0;
WHILE ( element ISNT nil element list )
AND NOT found element
DO
ec +:= 1;
found element := ( key OF element OF element = key );
IF found element
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:= HEAP AAELEMENTLIST
:= ( HEAP AAELEMENT := ( key
, HEAP AAVALUE :=
)
, ( elements OF array )[ hash value ]
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element OF found element
FI
END; # NEXT #
</lang>
=== The classic [http://web.comlab.ox.ac.uk/people/Jeremy.Gibbons/wg21/ UNESCO IFIP Working Group 2.1]'s standard prelude contents ===
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