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