clang/test/SemaTemplate/instantiate-member-pointers.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s
   2 struct Y {
   3   int x;
   4 };
   5
   6 template<typename T>
   7 struct X1 {
   8   int f(T* ptr, int T::*pm) { // expected-error{{member pointer}}
   9     return ptr->*pm;
  10   }
  11 };
  12
  13 template struct X1<Y>;
  14 template struct X1<int>; // expected-note{{instantiation}}
  15
  16 template<typename T, typename Class>
  17 struct X2 {
  18   T f(Class &obj, T Class::*pm) { // expected-error{{to a reference}} \
  19                       // expected-error{{member pointer to void}}
  20     return obj.*pm;
  21   }
  22 };
  23
  24 template struct X2<int, Y>;
  25 template struct X2<int&, Y>; // expected-note{{instantiation}}
  26 template struct X2<const void, Y>; // expected-note{{instantiation}}
  27
  28 template<typename T, typename Class, T Class::*Ptr>
  29 struct X3 {
  30   X3<T, Class, Ptr> &operator=(const T& value) {
  31     return *this;
  32   }
  33 };
  34
  35 X3<int, Y, &Y::x> x3;
  36
  37 typedef int Y::*IntMember;
  38
  39 template<IntMember Member>
  40 struct X4 {
  41   X3<int, Y, Member> member;
  42
  43   int &getMember(Y& y) { return y.*Member; }
  44 };
  45
  46 int &get_X4(X4<&Y::x> x4, Y& y) {
  47   return x4.getMember(y);
  48 }
  49
  50 template<IntMember Member>
  51 void accept_X4(X4<Member>);
  52
  53 void test_accept_X4(X4<&Y::x> x4) {
  54   accept_X4(x4);
  55 }
  56
  57 namespace ValueDepMemberPointer {
  58   template <void (*)()> struct instantiate_function {};
  59   template <typename T> struct S {
  60     static void instantiate();
  61     typedef instantiate_function<&S::instantiate> x; // expected-note{{instantiation}}
  62   };
  63   template <typename T> void S<T>::instantiate() {
  64     int a[(int)sizeof(T)-42]; // expected-error{{array with a negative size}}
  65   }
  66   S<int> s;
  67 }
  68
  69 namespace PR18192 {
  70   struct A { struct { int n; }; };
  71   template<int A::*> struct X {};
  72   constexpr int A::*p = &A::n;
  73   X<p> x; // expected-error{{not a pointer to member constant}}
  74 }