| // PR c++/88337 - Implement P1327R1: Allow dynamic_cast/typeid in constexpr. |
| // { dg-do compile { target c++20 } } |
| |
| // Adopted from g++.old-deja/g++.other/dyncast1.C. |
| // But use reference dynamic_cast. |
| |
| // 1. downcast |
| // 1.1. single inheritance case |
| |
| struct A { virtual void a(); }; |
| struct AA : A {}; |
| struct B : A {}; |
| struct BB : B {}; |
| class C : B {}; |
| struct D : C {}; |
| |
| struct CC : B {}; |
| class DD : CC {}; |
| |
| class CCC : protected B {}; |
| class DDD : protected CCC {}; |
| |
| constexpr D d; |
| constexpr bool b01 = (dynamic_cast<D&> ((A&)d), true); // { dg-error "reference .dynamic_cast. failed" } |
| // { dg-message "static type .const A. of its operand is a non-public base class of dynamic type .D." "" { target *-*-* } .-1 } |
| constexpr bool b02 = (dynamic_cast<D&> ((B&)d), true); // { dg-error "reference .dynamic_cast. failed" } |
| // { dg-message "static type .const B. of its operand is a non-public base class of dynamic type .D." "" { target *-*-* } .-1 } |
| static_assert (&d == &dynamic_cast<const D&> ((C&)d)); |
| constexpr bool b03 = (dynamic_cast<C&> ((B&)d), true); // { dg-error "reference .dynamic_cast. failed" } |
| // { dg-message "static type .const B. of its operand is a non-public base class of dynamic type .D." "" { target *-*-* } .-1 } |
| |
| constexpr DD dd; |
| constexpr bool b04 = (dynamic_cast<DD&> ((A&)dd), true); // { dg-error "reference .dynamic_cast. failed" } |
| // { dg-message "static type .const A. of its operand is a non-public base class of dynamic type .DD." "" { target *-*-* } .-1 } |
| constexpr bool b05 = (dynamic_cast<DD&> ((B&)dd), true); // { dg-error "reference .dynamic_cast. failed" } |
| // { dg-message "static type .const B. of its operand is a non-public base class of dynamic type .DD." "" { target *-*-* } .-1 } |
| |
| constexpr DDD ddd; |
| constexpr bool b06 = (dynamic_cast<DDD&> ((A&)ddd), true); // { dg-error "reference .dynamic_cast. failed" } |
| // { dg-message "static type .const A. of its operand is a non-public base class of dynamic type .DDD." "" { target *-*-* } .-1 } |
| constexpr bool b07 = (dynamic_cast<DDD&> ((B&)ddd), true); // { dg-error "reference .dynamic_cast. failed" } |
| // { dg-message "static type .const B. of its operand is a non-public base class of dynamic type .DDD." "" { target *-*-* } .-1 } |
| constexpr bool b08 = (dynamic_cast<CCC&> ((B&)ddd), true); // { dg-error "reference .dynamic_cast. failed" } |
| // { dg-message "static type .const B. of its operand is a non-public base class of dynamic type .DDD." "" { target *-*-* } .-1 } |
| |
| // 1.2. multiple inheritance case |
| // 1.2.1. all bases are public |
| |
| struct E : D, CC {}; |
| struct EE : CC, D {}; //Will search in reverse order. |
| |
| constexpr E e; |
| constexpr bool b09 = (dynamic_cast<E&> ((A&)(D&)e), true); // { dg-error "reference .dynamic_cast. failed" } |
| // { dg-message "static type .A. of its operand is a non-public base class of dynamic type .E." "" { target *-*-* } .-1 } |
| constexpr bool b10 = (dynamic_cast<E&> ((B&)(D&)e), true); // { dg-error "reference .dynamic_cast. failed" } |
| // { dg-message "static type .B. of its operand is a non-public base class of dynamic type .E." "" { target *-*-* } .-1 } |
| static_assert (&e == &dynamic_cast<E&> ((C&)(D&)e)); |
| static_assert (&e == &dynamic_cast<E&> ((B&)(CC&)e)); |
| static_assert (&(CC&)e == &dynamic_cast<CC&> ((B&)(CC&)e)); |
| |
| constexpr EE ee; |
| constexpr bool b11 = (dynamic_cast<EE&> ((A&)(D&)ee), true); // { dg-error "reference .dynamic_cast. failed" } |
| // { dg-message "static type .A. of its operand is a non-public base class of dynamic type .EE." "" { target *-*-* } .-1 } |
| constexpr bool b12 = (dynamic_cast<EE&> ((B&)(D&)ee), true); // { dg-error "reference .dynamic_cast. failed" } |
| // { dg-message "static type .B. of its operand is a non-public base class of dynamic type .EE." "" { target *-*-* } .-1 } |
| static_assert (&ee == &dynamic_cast<EE&> ((C&)(D&)ee)); |
| static_assert (&ee == &dynamic_cast<EE&> ((B&)(CC&)ee)); |
| static_assert (&(CC&)ee == &dynamic_cast<CC&> ((B&)(CC&)ee)); |
| |
| // 1.2.2 one or more branches are nonpublic |
| |
| struct X : private BB, E {}; |
| struct Y : AA, private B {}; |
| |
| class XX : BB, E {}; |
| |
| constexpr X x; |
| static_assert (&x == &dynamic_cast<X&>((B&)(CC&)(E&)x)); |
| |
| constexpr XX xx; |
| constexpr bool b13 = (dynamic_cast<XX&>((B&)(CC&)(E&)xx), true); // { dg-error "reference .dynamic_cast. failed" } |
| // { dg-message "static type .B. of its operand is a non-public base class of dynamic type .XX." "" { target *-*-* } .-1 } |
| |
| constexpr Y y; |
| constexpr bool b14 = (dynamic_cast<Y&>((B&)y), true); // { dg-error "reference .dynamic_cast. failed" } |
| // { dg-message "static type .const B. of its operand is a non-public base class of dynamic type .Y." "" { target *-*-* } .-1 } |
| constexpr bool b15 = (dynamic_cast<Y&>((A&)(B&)y), true); // { dg-error "reference .dynamic_cast. failed" } |
| // { dg-message "static type .A. of its operand is a non-public base class of dynamic type .Y." "" { target *-*-* } .-1 } |
| |
| // 2. crosscast |
| |
| struct J { virtual void j(); }; |
| struct K : CC, private J {}; |
| class KK : J, CC{}; |
| |
| constexpr bool b16 = (dynamic_cast<CC&> ((B&)(D&)e), true); // { dg-error "reference .dynamic_cast. failed" } |
| // { dg-message "static type .B. of its operand is a non-public base class of dynamic type .CC." "" { target *-*-* } .-1 } |
| static_assert (&(CC&)e == &dynamic_cast<CC&> ((C&)(D&)e)); |
| |
| constexpr K k; |
| constexpr bool b17 = (dynamic_cast<J&> ((B&)k), true); // { dg-error "reference .dynamic_cast. failed" } |
| // { dg-message "dynamic type .K. of its operand does not have an unambiguous public base class .J." "" { target *-*-* } .-1 } |
| constexpr KK kk; |
| constexpr bool b18 = (dynamic_cast<J&> ((CC&)kk), true); // { dg-error "reference .dynamic_cast. failed" } |
| // { dg-message "static type .const CC. of its operand is a non-public base class of dynamic type .KK." "" { target *-*-* } .-1 } |