clang/test/SemaCXX/cxx11-attributes-on-using-declaration.cpp

   1 // RUN: %clang_cc1 -pedantic -triple x86_64-apple-macos11 -std=c++20 -fsyntax-only -verify %s
   2
   3 static_assert(__has_extension(cxx_attributes_on_using_declarations), "");
   4
   5 namespace NS { typedef int x; }
   6
   7 [[clang::annotate("foo")]] using NS::x; // expected-warning{{ISO C++ does not allow an attribute list to appear here}}
   8
   9
  10 [[deprecated]] using NS::x;                                    // expected-warning {{'deprecated' currently has no effect on a using declaration}} expected-warning{{ISO C++ does not allow}}
  11 using NS::x [[deprecated]];                                    // expected-warning {{'deprecated' currently has no effect on a using declaration}} expected-warning{{ISO C++ does not allow}}
  12 using NS::x __attribute__((deprecated));                       // expected-warning {{'deprecated' currently has no effect on a using declaration}}
  13 using NS::x __attribute__((availability(macos,introduced=1))); // expected-warning {{'availability' currently has no effect on a using declaration}}
  14
  15 [[clang::availability(macos,introduced=1)]] using NS::x; // expected-warning {{'availability' currently has no effect on a using declaration}} expected-warning{{ISO C++ does not allow}}
  16
  17 // expected-warning@+1 3 {{ISO C++ does not allow an attribute list to appear here}}
  18 [[clang::annotate("A")]] using NS::x [[clang::annotate("Y")]], NS::x [[clang::annotate("Z")]];
  19
  20 template <class T>
  21 struct S : T {
  22   [[deprecated]] using typename T::x; // expected-warning{{ISO C++ does not allow}} expected-warning {{'deprecated' currently has no effect on a using declaration}}
  23   [[deprecated]] using T::y;          // expected-warning{{ISO C++ does not allow}} expected-warning {{'deprecated' currently has no effect on a using declaration}}
  24
  25   using typename T::z [[deprecated]]; // expected-warning{{ISO C++ does not allow}} expected-warning {{'deprecated' currently has no effect on a using declaration}}
  26   using T::a [[deprecated]];          // expected-warning{{ISO C++ does not allow}} expected-warning {{'deprecated' currently has no effect on a using declaration}}
  27 };
  28
  29 struct Base {};
  30
  31 template <class B>
  32 struct DepBase1 : B {
  33   using B::B [[]];
  34
  35 };
  36 template <class B>
  37 struct DepBase2 : B {
  38   using B::B __attribute__(());
  39 };
  40
  41 DepBase1<Base> db1;
  42 DepBase2<Base> db2;