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annotate gcc/testsuite/g++.dg/cpp2a/constexpr-dynamic1.C @ 145:1830386684a0

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gcc-9.2.0
author anatofuz
date Thu, 13 Feb 2020 11:34:05 +0900
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145
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1 // PR c++/88337 - Implement P1327R1: Allow dynamic_cast/typeid in constexpr.
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2 // { dg-do compile { target c++2a } }
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3
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4 // Downcast.
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5
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6 struct B {
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7 virtual void baz () {}
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8 };
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9
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10 struct D : B { };
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11
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12 constexpr bool
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13 fn ()
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14 {
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15 bool ok = true;
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16 B b;
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17 B *b1 = &b;
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18 if (D *pd = dynamic_cast<D*>(b1))
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19 ok = false;
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20
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21 D d;
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22 B *b2 = &d;
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23 if (D *pd = dynamic_cast<D*>(b2))
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24 /*OK*/;
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25 else
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26 ok = false;
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27
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28 return ok;
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29 }
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30
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31 static_assert(fn ());
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32
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33 constexpr D d;
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34 constexpr B b;
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35 constexpr B *b1 = const_cast<B*>(&b);
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36 constexpr B *b2 = const_cast<D*>(&d);
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37 static_assert(dynamic_cast<D*>(b2) == &d);
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38 static_assert(&dynamic_cast<D&>(*b2) == &d);
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39 static_assert(dynamic_cast<const B*>(&d) == &d);
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40 static_assert(&dynamic_cast<const B&>(d) == &d);