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comparison 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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131:84e7813d76e9 145:1830386684a0
1 // PR c++/88337 - Implement P1327R1: Allow dynamic_cast/typeid in constexpr.
2 // { dg-do compile { target c++2a } }
3
4 // Downcast.
5
6 struct B {
7 virtual void baz () {}
8 };
9
10 struct D : B { };
11
12 constexpr bool
13 fn ()
14 {
15 bool ok = true;
16 B b;
17 B *b1 = &b;
18 if (D *pd = dynamic_cast<D*>(b1))
19 ok = false;
20
21 D d;
22 B *b2 = &d;
23 if (D *pd = dynamic_cast<D*>(b2))
24 /*OK*/;
25 else
26 ok = false;
27
28 return ok;
29 }
30
31 static_assert(fn ());
32
33 constexpr D d;
34 constexpr B b;
35 constexpr B *b1 = const_cast<B*>(&b);
36 constexpr B *b2 = const_cast<D*>(&d);
37 static_assert(dynamic_cast<D*>(b2) == &d);
38 static_assert(&dynamic_cast<D&>(*b2) == &d);
39 static_assert(dynamic_cast<const B*>(&d) == &d);
40 static_assert(&dynamic_cast<const B&>(d) == &d);