Re: temporaries and const&
On Apr 30, 1:59 pm, "Victor Bazarov" <v.Abaza...@comAcast.net> wrote:
dragoncoder wrote:
Hi everyone, please consider the following function:-
const int& foo ( const double& d )
{
return d;
}
g++ compiles it with warnings and solaris CC gives error. I want to
know if the code is correct according to the standard ?
It's "correct", lexically and syntactically. The problem is that
the whole thing is useless because returning by a reference to const
will cause creation of a temporary object, which will survive only
until the end the call to 'foo'. IOW right after the function
returns the temporary object has already been destroyed.
I am under the impression that temporaries assigned to const
references are required to live as long as the reference.
However, wrt OP, I happen to know that Sun CC (Studio8) defaults to
non-standard behavior wrt the lifespan of temporaries. By default
temporaries live until the end of the block they are created in.
However, turning on standard behavior (-features=tmplife) is actually
broken because temporaries assigned to const refefrences are destroyed
before the reference is destroyed.
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