Re: UB when flowing off end of value-returning function

From:
"Balog Pal" <pasa@lib.hu>
Newsgroups:
comp.lang.c++
Date:
Wed, 3 Nov 2010 03:58:53 +0100
Message-ID:
<iaqir7$3jm$1@news.ett.com.ua>
"Scott Meyers" <NeverRead@aristeia.com>

And again I ask what Java and C# do with this kind of code? I'm a
programming monoglot, so I can't test it myself. I have an opinion about
what one might reasonably expect of a compiler given the above code, but
I'd like to know what decision was reached by people designing languages
for a living.


java langspec 3

8.4.7 Method Body

....

If a method is declared void, then its body must not contain any return
statement (?14.17) that has an Expression.

If a method is declared to have a return type, then every return statement
(?14.17) in its body must have an Expression. A compile-time error occurs if
the body of the method can complete normally (?14.1).

In other words, a method with a return type must return only by using a
return statement that provides a value return; it is not allowed to "drop
off the end of its body."

Note that it is possible for a method to have a declared return type and yet
contain no return statements. Here is one example:

class DizzyDean {

int pitch() { throw new RuntimeException("90 mph?!"); }

}

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