StackOverflow2013

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plurals

PO
primarykey
Id
20708538
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2013-12-20T17:02:49.890
FavoriteCount
0
LastActivityDate
2013-12-20T17:23:12.670
LastEditDate
2017-05-23T11:53:46.553
LastEditorUserId
-1
OwnerUserId
171933
ParentId
20706701
PostTypeId
2
Score
4
ViewCount
0
LastEditorDisplayName
text
Body
Update: The answer is 12, see update below. OK, this is actually a good question. So this explains what "copy-restore" is all about: <a href="https://stackoverflow.com/a/8871340/171933">https://stackoverflow.com/a/8871340/171933</a> Most programming languages don't support copy/restore, but only (some variations) of pass-by-value and pass-by-reference. So it's not so easy to try this out. However, the question you are interested in is this: Which value wins? Does <code>x</code> get to write its value back to <code>a</code> when the function ends (which would be 11), or does <code>y</code> get to write its value back to <code>a</code> when the function ends (which would be 12). In a language that supports "copy-restore", I'd hope that this would throw a compiler error. Update: After some searching I've found a language that actually supports "copy-restore", namely Ada. This is the code in Ada (this is my first and probably last program written in Ada): <pre><code>with Ada.Text_IO; use Ada.Text_IO; procedure copy_restore_example is a: integer; procedure p(x: in out integer; y: in out integer) is begin x:= x+1; y:= y+2; end p; begin a := 10; Put_Line("Before :" & natural'image(a)); p(a, a); Put_Line("After :" & natural'image(a)); end copy_restore_example; </code></pre> The result is 12, <code>y</code> wins. You can run this program in your browser here: <a href="http://www.compileonline.com/compile_ada_online.php" rel="nofollow noreferrer">http://www.compileonline.com/compile_ada_online.php</a>
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1. POConfusion in call by copy-restore in a special case
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1. USJohannes Fahrenkrug
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