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// RUN: %clang_cc1 -fsyntax-only -std=c++17 -verify %s
// RUN: %clang_cc1 -fsyntax-only -std=c++20 -verify %s
// p1099 'using SCOPEDENUM::MEMBER;'
namespace Zero {
namespace Bob {
enum class Kevin {
Stuart,
AlsoStuart
#if __cplusplus >= 202002L
// expected-note@-3{{target of using declaration}}
// expected-note@-3{{target of using declaration}}
#endif
};
} // namespace Bob
using Bob::Kevin::Stuart;
#if __cplusplus < 202002L
// expected-warning@-2{{using declaration naming a scoped enumerator is a C++20 extension}}
#else
using Bob::Kevin::Stuart;
auto b = Stuart;
namespace Foo {
int Stuart; // expected-note{{conflicting declaration}}
using Bob::Kevin::Stuart; // expected-error{{target of using declaration conflicts}}
using Bob::Kevin::AlsoStuart; // expected-note{{using declaration}}
int AlsoStuart; // expected-error{{declaration conflicts with target}}
} // namespace Foo
#endif
} // namespace Zero
namespace One {
// derived from [namespace.udecl]/3
enum class button { up,
down };
struct S {
using button::up;
#if __cplusplus < 202002L
// expected-warning@-2{{a C++20 extension}}
// expected-error@-3{{using declaration in class}}
#else
button b = up;
#endif
};
#if __cplusplus >= 202002L
// some more
struct T : S {
button c = up;
};
#endif
enum E2 { e2 };
} // namespace One
namespace Two {
enum class E1 { e1 };
struct S {
using One::e2;
#if __cplusplus < 202002L
// expected-error@-2{{using declaration in class}}
#else
One::E2 c = e2;
#endif
};
} // namespace Two
namespace Three {
enum E3 { e3 };
struct e3;
struct S {
using Three::e3; // expected-error{{using declaration in class}}
enum class E4 { e4 };
enum E5 { e5 };
};
using S::e5;
using S::E4::e4;
#if __cplusplus < 202002L
// expected-error@-3{{using declaration cannot refer to class member}}
// expected-note@-4{{use a constexpr variable instead}}
// expected-warning@-4{{a C++20 extension}}
// expected-error@-5{{using declaration cannot refer to class member}}
// expected-note@-6{{use a constexpr variable instead}}
#else
auto a = e4;
auto b = e5;
#endif
} // namespace Three
namespace Four {
template <typename T>
struct TPL {
enum class E1 { e1 };
struct IN {
enum class E2 { e2 };
};
protected:
enum class E3 { e3 }; // expected-note{{declared protected here}}
};
using TPL<int>::E1::e1;
#if __cplusplus < 202002L
// expected-warning@-2{{a C++20 extension}}
// expected-error@-3{{using declaration cannot refer to class member}}
// expected-note@-4{{use a constexpr variable instead}}
#else
using TPL<float>::IN::E2::e2;
auto a = e1;
auto b = e2;
#endif
enum class E4 { e4 };
template <typename T>
struct DER : TPL<int> {
using TPL<T>::E1::e1;
#if __cplusplus < 202002L
// expected-warning@-2{{a C++20 extension}}
// expected-warning@-3{{using declaration naming a scoped}}
// expected-error@-4{{which is not a base}}
#endif
using TPL<T>::E3::e3; // expected-error{{is a protected member}}
#if __cplusplus < 202002L
// expected-warning@-2 2{{using declaration naming a scoped}}
// expected-error@-3{{which is not a base}}
#endif
using E4::e4;
#if __cplusplus < 202002L
// expected-warning@-2{{a C++20 extension}}
// expected-error@-3{{which is not a class}}
#else
auto Foo() { return e1; }
auto Bar() { return e2; }
#endif
};
DER<float> x; // expected-note{{requested here}}
DER<int> y;
#if __cplusplus < 202002L
// expected-note@-2{{requested here}}
#else
auto y1 = y.Foo();
auto y2 = y.Bar();
#endif
} // namespace Four
namespace Five {
template <unsigned I, unsigned K>
struct Quux {
enum class Q : unsigned; // expected-note{{member is declared here}}
enum class R : unsigned { i = I,
k = K };
};
using Quux<1, 2>::Q::nothing; // expected-error{{implicit instantiation of undefined}}
using Quux<1, 2>::R::i;
#if __cplusplus < 202002L
// expected-warning@-2{{a C++20 extension}}
// expected-error@-3{{using declaration cannot refer to class member}}
// expected-note@-4{{use a constexpr variable instead}}
#endif
} // namespace Five
namespace Six {
template <unsigned I, unsigned K>
struct Quux {
enum class Q : unsigned; // expected-note{{member is declared here}}
enum class R : unsigned { i = I,
k = K };
};
template <unsigned I> struct Fido {
using Quux<I, I>::Q::nothing; // expected-error{{implicit instantiation of undefined}}
};
Fido<2> a; // expected-note{{in instantiation}}
} // namespace Six
namespace Seven {
template <unsigned I, unsigned K>
struct Quux {
enum class R : unsigned { i = I,
k = K };
};
template <unsigned I> struct Toto {
using Quux<I, I>::R::i;
#if __cplusplus < 202002L
// expected-warning@-2{{a C++20 extension}}
// expected-error@-3{{refers into}}
#else
static_assert(unsigned(i) == I);
#endif
};
Toto<2> b;
#if __cplusplus < 202002L
// expected-note@-2{{in instantiation}}
#endif
} // namespace Seven
namespace Eight {
struct Kevin {
enum class B { a };
enum a {};
};
using Kevin::B::a;
#if __cplusplus < 202002L
// expected-warning@-2{{a C++20 extension}}
// expected-error@-3{{using declaration cannot refer to class member}}
// expected-note@-4{{use a constexpr variable instead}}
#endif
using Kevin::B::a;
#if __cplusplus < 202002L
// expected-warning@-2{{a C++20 extension}}
// expected-error@-3{{using declaration cannot refer to class member}}
// expected-note@-4{{use a constexpr variable instead}}
#endif
class X : Kevin {
using Kevin::B::a; // expected-note{{previous using declaration}}
#if __cplusplus < 202002L
// expected-warning@-2{{a C++20 extension}}
#endif
using Kevin::a;
using Kevin::B::a; // expected-error{{redeclaration of using declaration}}
};
} // namespace Eight
namespace Nine {
namespace Q {
enum class Bob { a };
using Bob::a;
#if __cplusplus < 202002L
// expected-warning@-2{{a C++20 extension}}
#endif
} // namespace Q
using Q::a;
using Q::Bob::a;
#if __cplusplus < 202002L
// expected-warning@-2{{a C++20 extension}}
#endif
#if __cplusplus >= 202002L
struct Foo {
using Q::a; // expected-note{{previous using declaration}}
using Q::Bob::a;
using Q::a; // expected-error{{redeclaration of using declaration}}
};
#endif
} // namespace Nine
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