Mercurial > hg > CbC > CbC_gcc
view gcc/testsuite/g++.dg/cpp2a/constexpr-dynamic9.C @ 145:1830386684a0
gcc-9.2.0
author | anatofuz |
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date | Thu, 13 Feb 2020 11:34:05 +0900 |
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// PR c++/88337 - Implement P1327R1: Allow dynamic_cast/typeid in constexpr. // { dg-do compile { target c++2a } } // Ambiguous base. struct A { virtual void a(); }; struct B : A { virtual void b(); }; struct C : A { virtual void c(); }; struct D { virtual void a(); }; struct E : B, C, D { virtual void d(); }; constexpr E e; constexpr bool b1 = (dynamic_cast<A&>((D&)e), false); // { dg-error "reference .dynamic_cast. failed" } // { dg-message ".A. is an ambiguous base class of dynamic type .E. of its operand" "" { target *-*-* } .-1 } static_assert (dynamic_cast<A*>((D*)&e) == nullptr);