Mercurial > hg > CbC > CbC_gcc
view gcc/testsuite/g++.dg/cpp2a/constexpr-dynamic1.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 } } // Downcast. struct B { virtual void baz () {} }; struct D : B { }; constexpr bool fn () { bool ok = true; B b; B *b1 = &b; if (D *pd = dynamic_cast<D*>(b1)) ok = false; D d; B *b2 = &d; if (D *pd = dynamic_cast<D*>(b2)) /*OK*/; else ok = false; return ok; } static_assert(fn ()); constexpr D d; constexpr B b; constexpr B *b1 = const_cast<B*>(&b); constexpr B *b2 = const_cast<D*>(&d); static_assert(dynamic_cast<D*>(b2) == &d); static_assert(&dynamic_cast<D&>(*b2) == &d); static_assert(dynamic_cast<const B*>(&d) == &d); static_assert(&dynamic_cast<const B&>(d) == &d);