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comparison gcc/testsuite/g++.dg/cpp2a/constexpr-dynamic6.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 // Private base.
5
6 struct P1 { virtual void p1(); };
7 struct P2 { virtual void p2(); };
8 struct B : private P1 { virtual void b(); };
9 struct C { virtual void c(); };
10 struct A : B, C, private P2 { virtual void a(); };
11
12 constexpr A a;
13
14 // P1 is a non-public base of A.
15 constexpr bool b1 = (dynamic_cast<B&>((P1&)a), false); // { dg-error "reference .dynamic_cast. failed" }
16 // { dg-message "static type .const P1. of its operand is a non-public base class of dynamic type .A." "" { target *-*-* } .-1 }
17
18 // Don't error here.
19 static_assert (dynamic_cast<B*>((P1*)&a) == nullptr);
20
21 constexpr bool b2 = (dynamic_cast<C&>((P2&)a), false); // { dg-error "reference .dynamic_cast. failed" }
22 // { dg-message "static type .const P2. of its operand is a non-public base class of dynamic type .A." "" { target *-*-* } .-1 }
23
24 static_assert (dynamic_cast<C*>((P1*)&a) == nullptr);
25 static_assert (dynamic_cast<C*>((P2*)&a) == nullptr);