b04445d4a8
C++20 isn't final quite yet, but all that remains is formalities, so let's go ahead and change all the references. I think for the next C++ standard we can just call it C++23 rather than C++2b, since the committee has been consistent about time-based releases rather than feature-based. gcc/c-family/ChangeLog 2020-05-13 Jason Merrill <jason@redhat.com> * c.opt (std=c++20): Make c++2a the alias. (std=gnu++20): Likewise. * c-common.h (cxx_dialect): Change cxx2a to cxx20. * c-opts.c: Adjust. * c-cppbuiltin.c: Adjust. * c-ubsan.c: Adjust. * c-warn.c: Adjust. gcc/cp/ChangeLog 2020-05-13 Jason Merrill <jason@redhat.com> * call.c, class.c, constexpr.c, constraint.cc, decl.c, init.c, lambda.c, lex.c, method.c, name-lookup.c, parser.c, pt.c, tree.c, typeck2.c: Change cxx2a to cxx20. libcpp/ChangeLog 2020-05-13 Jason Merrill <jason@redhat.com> * include/cpplib.h (enum c_lang): Change CXX2A to CXX20. * init.c, lex.c: Adjust.
106 lines
5.6 KiB
C
106 lines
5.6 KiB
C
// PR c++/88337 - Implement P1327R1: Allow dynamic_cast/typeid in constexpr.
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// { dg-do compile { target c++20 } }
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// Adopted from g++.old-deja/g++.other/dyncast1.C.
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// But use reference dynamic_cast.
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// 1. downcast
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// 1.1. single inheritance case
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struct A { virtual void a(); };
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struct AA : A {};
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struct B : A {};
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struct BB : B {};
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class C : B {};
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struct D : C {};
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struct CC : B {};
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class DD : CC {};
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class CCC : protected B {};
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class DDD : protected CCC {};
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constexpr D d;
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constexpr bool b01 = (dynamic_cast<D&> ((A&)d), true); // { dg-error "reference .dynamic_cast. failed" }
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// { dg-message "static type .const A. of its operand is a non-public base class of dynamic type .D." "" { target *-*-* } .-1 }
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constexpr bool b02 = (dynamic_cast<D&> ((B&)d), true); // { dg-error "reference .dynamic_cast. failed" }
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// { dg-message "static type .const B. of its operand is a non-public base class of dynamic type .D." "" { target *-*-* } .-1 }
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static_assert (&d == &dynamic_cast<const D&> ((C&)d));
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constexpr bool b03 = (dynamic_cast<C&> ((B&)d), true); // { dg-error "reference .dynamic_cast. failed" }
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// { dg-message "static type .const B. of its operand is a non-public base class of dynamic type .D." "" { target *-*-* } .-1 }
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constexpr DD dd;
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constexpr bool b04 = (dynamic_cast<DD&> ((A&)dd), true); // { dg-error "reference .dynamic_cast. failed" }
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// { dg-message "static type .const A. of its operand is a non-public base class of dynamic type .DD." "" { target *-*-* } .-1 }
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constexpr bool b05 = (dynamic_cast<DD&> ((B&)dd), true); // { dg-error "reference .dynamic_cast. failed" }
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// { dg-message "static type .const B. of its operand is a non-public base class of dynamic type .DD." "" { target *-*-* } .-1 }
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constexpr DDD ddd;
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constexpr bool b06 = (dynamic_cast<DDD&> ((A&)ddd), true); // { dg-error "reference .dynamic_cast. failed" }
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// { dg-message "static type .const A. of its operand is a non-public base class of dynamic type .DDD." "" { target *-*-* } .-1 }
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constexpr bool b07 = (dynamic_cast<DDD&> ((B&)ddd), true); // { dg-error "reference .dynamic_cast. failed" }
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// { dg-message "static type .const B. of its operand is a non-public base class of dynamic type .DDD." "" { target *-*-* } .-1 }
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constexpr bool b08 = (dynamic_cast<CCC&> ((B&)ddd), true); // { dg-error "reference .dynamic_cast. failed" }
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// { dg-message "static type .const B. of its operand is a non-public base class of dynamic type .DDD." "" { target *-*-* } .-1 }
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// 1.2. multiple inheritance case
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// 1.2.1. all bases are public
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struct E : D, CC {};
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struct EE : CC, D {}; //Will search in reverse order.
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constexpr E e;
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constexpr bool b09 = (dynamic_cast<E&> ((A&)(D&)e), true); // { dg-error "reference .dynamic_cast. failed" }
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// { dg-message "static type .A. of its operand is a non-public base class of dynamic type .E." "" { target *-*-* } .-1 }
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constexpr bool b10 = (dynamic_cast<E&> ((B&)(D&)e), true); // { dg-error "reference .dynamic_cast. failed" }
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// { dg-message "static type .B. of its operand is a non-public base class of dynamic type .E." "" { target *-*-* } .-1 }
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static_assert (&e == &dynamic_cast<E&> ((C&)(D&)e));
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static_assert (&e == &dynamic_cast<E&> ((B&)(CC&)e));
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static_assert (&(CC&)e == &dynamic_cast<CC&> ((B&)(CC&)e));
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constexpr EE ee;
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constexpr bool b11 = (dynamic_cast<EE&> ((A&)(D&)ee), true); // { dg-error "reference .dynamic_cast. failed" }
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// { dg-message "static type .A. of its operand is a non-public base class of dynamic type .EE." "" { target *-*-* } .-1 }
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constexpr bool b12 = (dynamic_cast<EE&> ((B&)(D&)ee), true); // { dg-error "reference .dynamic_cast. failed" }
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// { dg-message "static type .B. of its operand is a non-public base class of dynamic type .EE." "" { target *-*-* } .-1 }
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static_assert (&ee == &dynamic_cast<EE&> ((C&)(D&)ee));
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static_assert (&ee == &dynamic_cast<EE&> ((B&)(CC&)ee));
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static_assert (&(CC&)ee == &dynamic_cast<CC&> ((B&)(CC&)ee));
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// 1.2.2 one or more branches are nonpublic
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struct X : private BB, E {};
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struct Y : AA, private B {};
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class XX : BB, E {};
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constexpr X x;
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static_assert (&x == &dynamic_cast<X&>((B&)(CC&)(E&)x));
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constexpr XX xx;
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constexpr bool b13 = (dynamic_cast<XX&>((B&)(CC&)(E&)xx), true); // { dg-error "reference .dynamic_cast. failed" }
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// { dg-message "static type .B. of its operand is a non-public base class of dynamic type .XX." "" { target *-*-* } .-1 }
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constexpr Y y;
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constexpr bool b14 = (dynamic_cast<Y&>((B&)y), true); // { dg-error "reference .dynamic_cast. failed" }
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// { dg-message "static type .const B. of its operand is a non-public base class of dynamic type .Y." "" { target *-*-* } .-1 }
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constexpr bool b15 = (dynamic_cast<Y&>((A&)(B&)y), true); // { dg-error "reference .dynamic_cast. failed" }
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// { dg-message "static type .A. of its operand is a non-public base class of dynamic type .Y." "" { target *-*-* } .-1 }
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// 2. crosscast
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struct J { virtual void j(); };
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struct K : CC, private J {};
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class KK : J, CC{};
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constexpr bool b16 = (dynamic_cast<CC&> ((B&)(D&)e), true); // { dg-error "reference .dynamic_cast. failed" }
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// { dg-message "static type .B. of its operand is a non-public base class of dynamic type .CC." "" { target *-*-* } .-1 }
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static_assert (&(CC&)e == &dynamic_cast<CC&> ((C&)(D&)e));
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constexpr K k;
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constexpr bool b17 = (dynamic_cast<J&> ((B&)k), true); // { dg-error "reference .dynamic_cast. failed" }
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// { dg-message "dynamic type .K. of its operand does not have an unambiguous public base class .J." "" { target *-*-* } .-1 }
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constexpr KK kk;
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constexpr bool b18 = (dynamic_cast<J&> ((CC&)kk), true); // { dg-error "reference .dynamic_cast. failed" }
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// { dg-message "static type .const CC. of its operand is a non-public base class of dynamic type .KK." "" { target *-*-* } .-1 }
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