clang/test/Parser/using-if-exists-attr.cpp

   1 // RUN: %clang_cc1 -std=c++20 -fsyntax-only %s -pedantic -verify
   2
   3 #define UIE __attribute__((using_if_exists))
   4
   5 namespace NS {
   6 typedef int x;
   7 }
   8
   9 using NS::x __attribute__((using_if_exists));
  10
  11 using NS::x [[clang::using_if_exists]]; // expected-warning{{ISO C++ does not allow an attribute list to appear here}}
  12
  13 [[clang::using_if_exists]] // expected-warning{{ISO C++ does not allow an attribute list to appear here}}
  14 using NS::not_there,
  15     NS::not_there2;
  16
  17 using NS::not_there3,                          // expected-error {{no member named 'not_there3' in namespace 'NS'}}
  18     NS::not_there4 [[clang::using_if_exists]]; // expected-warning{{C++ does not allow an attribute list to appear here}}
  19
  20 [[clang::using_if_exists]] using NS::not_there5 [[clang::using_if_exists]]; // expected-warning 2 {{ISO C++ does not allow}}
  21
  22 struct Base {};
  23 struct Derived : Base {
  24   [[clang::using_if_exists]] using Base::x;          // expected-warning {{ISO C++ does not allow an attribute list to appear here}}
  25   using Base::y [[clang::using_if_exists]];          // expected-warning {{ISO C++ does not allow an attribute list to appear here}}
  26   [[clang::using_if_exists]] using Base::z, Base::q; // expected-warning {{C++ does not allow an attribute list to appear here}}
  27 };