clang/test/SemaCXX/elaborated-type-specifier.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -verify %s
   2
   3 // Test the use of elaborated-type-specifiers to inject the names of
   4 // structs (or classes or unions) into an outer scope as described in
   5 // C++ [basic.scope.pdecl]p5.
   6 typedef struct S1 {
   7   union {
   8     struct S2 *x;
   9     struct S3 *y;
  10   };
  11 } S1;
  12
  13 bool test_elab(S1 *s1, struct S2 *s2, struct S3 *s3) {
  14   if (s1->x == s2) return true;
  15   if (s1->y == s3) return true;
  16   return false;
  17 }
  18
  19 namespace NS {
  20   class X {
  21   public:
  22     void test_elab2(struct S4 *s4); // expected-note{{'NS::S4' declared here}}
  23   };
  24
  25   void X::test_elab2(S4 *s4) { } // expected-note{{passing argument to parameter 's4' here}}
  26 }
  27
  28 void test_X_elab(NS::X x) {
  29   struct S4 *s4 = 0; // expected-note{{'S4' is not defined, but forward declared here; conversion would be valid if it was derived from 'NS::S4'}}
  30   x.test_elab2(s4); // expected-error{{cannot initialize a parameter of type 'NS::S4 *' with an lvalue of type 'struct S4 *'}}
  31 }
  32
  33 namespace NS {
  34   S4 *get_S4();
  35 }
  36
  37 void test_S5_scope() {
  38   S4 *s4; // expected-error{{unknown type name 'S4'; did you mean 'NS::S4'?}}
  39 }
  40
  41 int test_funcparam_scope(struct S5 * s5) {
  42   struct S5 { int y; } *s5_2 = 0;
  43   if (s5 == s5_2) return 1; // expected-error {{comparison of distinct pointer types ('struct S5 *' and 'struct S5 *')}}
  44   return 0;
  45 }
  46
  47 namespace test5 {
  48   struct A {
  49     class __attribute__((visibility("hidden"))) B {};
  50
  51     void test(class __attribute__((visibility("hidden"), noreturn)) B b) { // expected-warning {{'noreturn' attribute only applies to functions and methods}}
  52     }
  53   };
  54 }
  55
  56 namespace test6 {
  57 struct C {
  58   template <typename> friend struct A; // expected-note {{'A' declared here}}
  59 };
  60 struct B {
  61   struct A *p; // expected-error {{implicit declaration introduced by elaborated type conflicts with a template of the same name}}
  62 };
  63 }