p1.cpp revision 2fe9b7fb07dff15dd15dd8755a9a9e6de0fe46fc 
1// RUN: %clang_cc1 -fsyntax-only -fdiagnostics-show-option -verify %s
2
3// C++98 [basic.lookup.classref]p1:
4//   In a class member access expression (5.2.5), if the . or -> token is
5//   immediately followed by an identifier followed by a <, the identifier must
6//   be looked up to determine whether the < is the beginning of a template
7//   argument list (14.2) or a less-than operator. The identifier is first
8//   looked up in the class of the object expression. If the identifier is not
9//   found, it is then looked up in the context of the entire postfix-expression
10//   and shall name a class or function template. If the lookup in the class of
11//   the object expression finds a template, the name is also looked up in the
12//   context of the entire postfix-expression and
13//    -- if the name is not found, the name found in the class of the object
14//       expression is used, otherwise
15//    -- if the name is found in the context of the entire postfix-expression
16//       and does not name a class template, the name found in the class of the
17//       object expression is used, otherwise
18//    -- if the name found is a class template, it must refer to the same
19//       entity as the one found in the class of the object expression,
20//       otherwise the program is ill-formed.
21
22// From PR 7247
23template<typename T>
24struct set{};  // expected-note{{lookup from the current scope refers here}}
25struct Value {
26  template<typename T>
27  void set(T value) {}  // expected-note{{lookup in the object type 'Value' refers here}}
28
29  void resolves_to_same() {
30    Value v;
31    v.set<double>(3.2);
32  }
33};
34void resolves_to_different() {
35  {
36    Value v;
37    // The fact that the next line is a warning rather than an error is an
38    // extension.
39    v.set<double>(3.2);  // expected-warning{{lookup of 'set' in member access expression is ambiguous; using member of 'Value'}}
40  }
41  {
42    int set;  // Non-template.
43    Value v;
44    v.set<double>(3.2);
45  }
46}
47
48namespace rdar9915664 {
49  struct A {
50    template<typename T> void a();
51  };
52
53  struct B : A { };
54
55  struct C : A { };
56
57  struct D : B, C {
58    A &getA() { return static_cast<B&>(*this); }
59
60    void test_a() {
61      getA().a<int>();
62    }
63  };
64}
65