http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57575
Daniel Krügler <daniel.kruegler at googlemail dot com> changed:
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--- Comment #1 from Daniel Krügler <daniel.kruegler at googlemail dot com> ---
Your assumptions are mistaken. In C++ it is valid to bind a function value to
an rvalue reference of that function type. It is only so, that binding to an
lvalue reference is preferred.
In other words, the following is valid as well:
float f() { return 0.f; }
float (&&r)(void) = f;
See for example [over.ics.ref] p3 (emphasis mine):
"Except for an implicit object parameter, for which see 13.3.1, a standard
conversion sequence cannot be formed if it requires [..] binding an rvalue
reference to an lvalue **other than a function lvalue**."
