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
685 B
C
23 lines
685 B
C
// PR c++/88337 - Implement P1327R1: Allow dynamic_cast/typeid in constexpr.
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// { dg-do compile { target c++20 } }
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// Multiple levels.
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struct A { virtual void a(); };
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struct B : A { virtual void b(); };
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struct C : B { virtual void c(); };
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struct D : C { virtual void d(); };
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struct E : D { virtual void e(); };
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struct F : E { virtual void f(); };
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constexpr F f;
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// F->C->A->B == F->C->B
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static_assert (&dynamic_cast<B&>((A&)(C&)f) == &(B&)(C&)f);
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// F->A->E == F->E
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static_assert (&dynamic_cast<E&>((A&)f) == &(E&)f);
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// F->E->D->C->B->A->C == F->C
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static_assert (&dynamic_cast<C&>((A&)(B&)(C&)(D&)(E&)f) == &(C&)f);
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// F->B->F == F
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static_assert (&dynamic_cast<F&>((B&)f) == &f);
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