clang/test/SemaCXX/ref-init-ambiguous.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -verify %s -std=c++11
   2
   3 enum E2 { };
   4
   5 struct A {
   6   operator E2&(); // expected-note 3 {{candidate function}}
   7 };
   8
   9 struct B {
  10   operator E2&(); // expected-note 3 {{candidate function}}
  11 };
  12
  13 struct C : B, A {
  14 };
  15
  16 void test(C c) {
  17   const E2 &e2 = c; // expected-error {{reference initialization of type 'const E2 &' with initializer of type 'C' is ambiguous}}
  18 }
  19
  20 void foo(const E2 &);// expected-note{{passing argument to parameter here}}
  21
  22 const E2 & re(C c) {
  23     foo(c); // expected-error {{reference initialization of type 'const E2 &' with initializer of type 'C' is ambiguous}}
  24
  25     return c; // expected-error {{reference initialization of type 'const E2 &' with initializer of type 'C' is ambiguous}}
  26 }
  27
  28 namespace CWG2352 {
  29   void f(const int * const &) = delete;
  30   void f(int *);
  31
  32   void g(int * &);
  33   void g(const int *) = delete;
  34
  35   void h1(int *const * const &);
  36   void h1(const int *const *) = delete;
  37   void h2(const int *const * const &) = delete;
  38   void h2(int *const *);
  39
  40   void test() {
  41     int *x;
  42     // Under CWG2352, this became ambiguous. We order by qualification
  43     // conversion even when comparing a reference binding to a
  44     // non-reference-binding.
  45     f(x);
  46     g(x);
  47     h1(&x);
  48     h2(&x);
  49   }
  50 }