b04445d4a8
C++20 isn't final quite yet, but all that remains is formalities, so let's go ahead and change all the references. I think for the next C++ standard we can just call it C++23 rather than C++2b, since the committee has been consistent about time-based releases rather than feature-based. gcc/c-family/ChangeLog 2020-05-13 Jason Merrill <jason@redhat.com> * c.opt (std=c++20): Make c++2a the alias. (std=gnu++20): Likewise. * c-common.h (cxx_dialect): Change cxx2a to cxx20. * c-opts.c: Adjust. * c-cppbuiltin.c: Adjust. * c-ubsan.c: Adjust. * c-warn.c: Adjust. gcc/cp/ChangeLog 2020-05-13 Jason Merrill <jason@redhat.com> * call.c, class.c, constexpr.c, constraint.cc, decl.c, init.c, lambda.c, lex.c, method.c, name-lookup.c, parser.c, pt.c, tree.c, typeck2.c: Change cxx2a to cxx20. libcpp/ChangeLog 2020-05-13 Jason Merrill <jason@redhat.com> * include/cpplib.h (enum c_lang): Change CXX2A to CXX20. * init.c, lex.c: Adjust.
23 lines
646 B
C
23 lines
646 B
C
// PR c++/93414 - poor diagnostic for dynamic_cast in constexpr context.
|
|
// { dg-do compile { target c++20 } }
|
|
// Here 'b' doesn't point/refer to a public base of Derived.
|
|
|
|
struct Base {
|
|
constexpr virtual ~Base(){}
|
|
};
|
|
|
|
struct Derived: Base {
|
|
constexpr ~Derived(){}
|
|
};
|
|
|
|
constexpr const Derived& cast(const Base& b) {
|
|
return dynamic_cast<const Derived&>(b); // { dg-error "reference .dynamic_cast. failed" }
|
|
// { dg-message "dynamic type .const Base. of its operand does not have a base class of type .Derived." "" { target *-*-* } .-1 }
|
|
}
|
|
|
|
auto test() {
|
|
static constexpr Base b;
|
|
constexpr auto res = cast(b);
|
|
return res;
|
|
}
|