Mercurial > hg > CbC > CbC_gcc
view gcc/testsuite/g++.dg/cpp2a/constexpr-dynamic16.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 } } // Here the hint turns out to be wrong: A is a public base of B2, but the // dynamic_cast operand is not that subobject, but rather a sibling base of // B2. struct A { virtual void f(); }; struct B1: A { }; struct B2: A { }; struct C: B1, B2 { }; constexpr C c; constexpr A *ap = (B1*)&c; constexpr A &ar = (B1&)c; constexpr auto p = dynamic_cast<B2*>(ap); static_assert (p != nullptr); constexpr auto p2 = dynamic_cast<B2&>(ar); static_assert(dynamic_cast<B2*>(ap) == (B2*)&c); static_assert(dynamic_cast<B2*>((B1*)&c) == (B2*)&c); static_assert(&dynamic_cast<B2&>((B1&)c) == &(B2&)c);