Re: Odd behavior with type inference
"Kevin McMurtrie" <mcmurtrie@pixelmemory.us> wrote in message
news:4c96febf$0$22089$742ec2ed@news.sonic.net...
In article <i75j8j$fo7$1@news.eternal-september.org>,
markspace <nospam@nowhere.com> wrote:
On 9/19/2010 10:25 AM, Mike Schilling wrote:
public static<T,C> Iterable<C> getOddity(Collection<T> coll, Class<C>
clazz)
That is, it looks as if the inference that getOddity should return an
Iterable<String> fails.
I read that reversed: that it was "coll" that was assumed to be of type
"T" = String. Sure enough, when I remove the T from the static method,
and replace the type parameter of coll to be ?, then it also compiles.
Seems like a bug either way, unless there some special rule where T is
only used in one place in a parametrized method definition. That would
be kinda odd though.
Generics are unfortunately all-or-nothing. You're lucky that it didn't
compile. Some flaws in generics results in code that compiles but
logically can't execute (ClassCastException is thrown).
This case is odder, though. The fact that parameter 1 was a raw type
interfered with an completely valid inference to be drawn from parameter 2.
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