clang/test/SemaCXX/ms-friend-lookup.cpp

   1 // RUN: %clang_cc1 %s -triple i686-pc-win32 -std=c++11 -Wmicrosoft -fms-compatibility -verify
   2 // RUN: not %clang_cc1 %s -triple i686-pc-win32 -std=c++11 -Wmicrosoft -fms-compatibility -fdiagnostics-parseable-fixits 2>&1 | FileCheck %s
   3
   4 struct X;
   5 namespace name_at_tu_scope {
   6 struct Y {
   7   friend struct X; // expected-warning-re {{unqualified friend declaration {{.*}} is a Microsoft extension}}
   8   // CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:17-[[@LINE-1]]:17}:"::"
   9 };
  10 }
  11
  12 namespace enclosing_friend_decl {
  13 struct B;
  14 namespace ns {
  15 struct A {
  16   friend struct B; // expected-warning-re {{unqualified friend declaration {{.*}} is a Microsoft extension}}
  17   // CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:17-[[@LINE-1]]:17}:"enclosing_friend_decl::"
  18 protected:
  19   A();
  20 };
  21 }
  22 struct B {
  23   static void f() { ns::A x; }
  24 };
  25 }
  26
  27 namespace enclosing_friend_qualified {
  28 struct B;
  29 namespace ns {
  30 struct A {
  31   friend struct enclosing_friend_qualified::B; // Adding name specifiers fixes it.
  32 protected:
  33   A();
  34 };
  35 }
  36 struct B {
  37   static void f() { ns::A x; }
  38 };
  39 }
  40
  41 namespace enclosing_friend_no_tag {
  42 struct B;
  43 namespace ns {
  44 struct A {
  45   friend B; // Removing the tag decl fixes it.
  46 protected:
  47   A();
  48 };
  49 }
  50 struct B {
  51   static void f() { ns::A x; }
  52 };
  53 }
  54
  55 namespace enclosing_friend_func {
  56 void f();
  57 namespace ns {
  58 struct A {
  59   // Amusingly, in MSVC, this declares ns::f(), and doesn't find the outer f().
  60   friend void f();
  61 protected:
  62   A(); // expected-note {{declared protected here}}
  63 };
  64 }
  65 void f() { ns::A x; } // expected-error {{calling a protected constructor of class 'enclosing_friend_func::ns::A'}}
  66 }
  67
  68 namespace test_nns_fixit_hint {
  69 namespace name1 {
  70 namespace name2 {
  71 struct X;
  72 struct name2;
  73 namespace name3 {
  74 struct Y {
  75   friend struct X; // expected-warning-re {{unqualified friend declaration {{.*}} is a Microsoft extension}}
  76   // CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:17-[[@LINE-1]]:17}:"name1::name2::"
  77 };
  78 }
  79 }
  80 }
  81 }
  82
  83 // A friend declaration injects a forward declaration into the nearest enclosing
  84 // non-member scope.
  85 namespace friend_as_a_forward_decl {
  86
  87 class A {
  88   class Nested {
  89     friend class B;
  90     B *b;
  91   };
  92   B *b;
  93 };
  94 B *global_b;
  95
  96 void f() {
  97   class Local {
  98     friend class Z;
  99     Z *b;
 100   };
 101   Z *b;
 102 }
 103
 104 }