https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100708
Bug ID: 100708
Summary: dynamic_cast can convert xvalue to lvalue
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: rs2740 at gmail dot com
Target Milestone: ---
GCC accepts
struct A { virtual ~A() {}; };
struct B : A {} b;
void g ()
{
dynamic_cast<B&>(static_cast<A&&>(b));
}
[expr.dynamic.cast]/2 says that for dynamic_cast<T>(v):
If T is an lvalue reference type, v shall be an lvalue of a complete class
type, and the result is an lvalue of the type referred to by T.
