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Derar
Novice
Joined: 09 Sep 2006
Posts: 44
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 Posted: Mon Aug 30, 2010 3:12 pm
[3.23a] Datatypes behaving weirdly - %push example
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When using %push to add an item to the front of a list, if the destination list is a single-value variable, %push will expand the variable and create a new variable as a list named after that variable.
Example:
| Code: |
TestVar = 5
#SHOW %push(4, @TestVar)
#SHOW %push(4, @TestVar)
#SHOW %push(4, @TestVar)
#SHOW %push(4, @TestVar)
#SHOW %push(4, TestVar)
#SHOW %push(4, @TestVar)
#SHOW @{@TestVar}
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Outputs:
| Code: |
4
4|4
4|4|4
4|4|4|4
4|5
4|4|5
4|4|5
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Additionally, the package editor will now show a variable named 5 with {4|4|4|4} as its value.
Now, the non-@ call (#SHOW %push(4, TestVar)) works properly, and explicitly forces TestVar to be data type String(List) in the Package Editor. However, if I then enter TestVar = 6, and check again, TestVar has reverted to AutoType and continues the above problems, now building on to a var named 6 as it had been with 5. For more fun, if I force TestVar to be a String(List) in the package editor, it works fine with either syntax, however, if I then "reset" TestVar with TestVar = 5 again, it reverts to AutoType once more.
Also, though I couldn't tell you if this used to happen or not before, if I set TestVar to Integer in the package editor, then run the push, it displays the same as orginal problem, except that this time the growing list is stored in a var named 0.
Previously, I never had issues resetting lists to initial values (List = 1), and continuing to work with it with additem or push. |
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Tech
GURU
Joined: 18 Oct 2000
Posts: 2733
Location: Atlanta, USA
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Posted: Mon Aug 30, 2010 3:52 pm
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I believe the issue is related to the by-reference passing of the list discussed in this post. However the behavior you described still sounds erroneous.
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Asati di tempari! |
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Zugg
MASTER
Joined: 25 Sep 2000
Posts: 23379
Location: Colorado, USA
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Posted: Mon Aug 30, 2010 4:14 pm
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Confirmed and added to bug list. Looks like %push is modifying the string list even when using @TestVar, which is shouldn't.
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