StackOverflow2013

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plurals

PO
primarykey
Id
20754621
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
3
CommunityOwnedDate
CreationDate
2013-12-24T03:52:43.183
FavoriteCount
0
LastActivityDate
2014-01-01T08:57:52.637
LastEditDate
2014-01-01T08:57:52.637
LastEditorUserId
770567
OwnerUserId
770567
ParentId
20754172
PostTypeId
2
Score
2
ViewCount
0
LastEditorDisplayName
text
Body
<code>(Byte)1 + (Byte)2</code> would result in a byte type, regardless of the parenthesis. <code>(Byte)1 + (Byte)2 instanceof Integer</code> fails since it would first evaluate "2 instanceof Integer" to true and then try to cast true to Byte resulting in a cast exception. UPDATE 1/1/2014: I took a closer look since it's a valid question as to why the assert doesn't produce a cast error too, here is what I found. Given this script: <pre><code>(Byte)1+(Byte)2 instanceof Integer assert (Byte)1+(Byte)2 instanceof Integer </code></pre> According <a href="http://groovy.codehaus.org/Compiler+Phase+Guide" rel="nofollow">to the documentation</a>, the Groovy compiler parses the script and creates an AST representation of the code based on a grammar. The first line is parsed into an <code>ExpressionStatement</code> (specifically a <code>CastExpression</code>) but the second line is parsed into an <code>AssertStatement</code>. An <code>AssertStatement</code> in Groovy's AST has a <code>BooleanExpression</code> child and it seems without clarifying parenthesis, this influences how it decides to parse the code... the two lines end up looking like this: <pre><code>((1 + ((2) as Byte) instanceof Integer) as Byte) assert ((1) as Byte) + ((2) as Byte) instanceof Integer : null </code></pre> This is why the assert runs and ends up being true when the other results in a GroovyCastException. I'm not sure if this is a bug or not... I'm going to ask on the Groovy forum I think.
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PostParentId
1. POgroovy type coercion with parentheses
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PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USchrixian
UserOwnerUserId
1. USchrixian
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2. VO
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