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comparison gcc/testsuite/g++.dg/cpp2a/constexpr-dynamic18.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++/93414 - poor diagnostic for dynamic_cast in constexpr context.
2 // { dg-do compile { target c++2a } }
3 // Here 'b' doesn't point/refer to a public base of Derived.
4
5 struct Base {
6 constexpr virtual ~Base(){}
7 };
8
9 struct Derived: Base {
10 constexpr ~Derived(){}
11 };
12
13 constexpr const Derived& cast(const Base& b) {
14 return dynamic_cast<const Derived&>(b); // { dg-error "reference .dynamic_cast. failed" }
15 // { dg-message "dynamic type .const Base. of its operand does not have a base class of type .Derived." "" { target *-*-* } .-1 }
16 }
17
18 auto test() {
19 static constexpr Base b;
20 constexpr auto res = cast(b);
21 return res;
22 }