Viewing file:  constexpr-dynamic6.C (1.01 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
// PR c++/88337 - Implement P1327R1: Allow dynamic_cast/typeid in constexpr.
// { dg-do compile { target c++20 } }
// Private base.
struct P1 { virtual void p1(); };
struct P2 { virtual void p2(); };
struct B : private P1 { virtual void b(); };
struct C { virtual void c(); };
struct A : B, C, private P2 { virtual void a(); };
constexpr A a;
// P1 is a non-public base of A.
constexpr bool b1 = (dynamic_cast<B&>((P1&)a), false); // { dg-error "reference .dynamic_cast. failed" }
// { dg-message "static type .const P1. of its operand is a non-public base class of dynamic type .A." "" { target *-*-* } .-1 }
// Don't error here.
static_assert (dynamic_cast<B*>((P1*)&a) == nullptr);
constexpr bool b2 = (dynamic_cast<C&>((P2&)a), false); // { dg-error "reference .dynamic_cast. failed" }
// { dg-message "static type .const P2. of its operand is a non-public base class of dynamic type .A." "" { target *-*-* } .-1 }
static_assert (dynamic_cast<C*>((P1*)&a) == nullptr);
static_assert (dynamic_cast<C*>((P2*)&a) == nullptr);
|
