clang/test/SemaTemplate/resolve-single-template-id.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s
   2
   3 namespace std {
   4   class type_info {};
   5 }
   6
   7 void one() { }
   8 void two() { } // expected-note 4{{possible target for call}}
   9 void two(int) { } // expected-note 4{{possible target for call}}
  10
  11 template<class T> void twoT() { } // expected-note 5{{possible target for call}}
  12 template<class T> void twoT(int) { } // expected-note 5{{possible target for call}}
  13
  14 template<class T> void oneT() { }
  15 template<class T, class U> void oneT(U) { }
  16 /*
  17 The target can be
  18  an object or reference being initialized (8.5, 8.5.3),
  19  the left side of an assignment (5.17),
  20  a parameter of a function (5.2.2),
  21  a parameter of a user-defined operator (13.5),
  22  the return value of a function, operator function, or conversion (6.6.3),
  23  an explicit type conversion (5.2.3, 5.2.9, 5.4), or
  24  a non-type template-parameter (14.3.2)
  25 */
  26 //#include <typeinfo>
  27 template<void (*p)(int)> struct test { };
  28
  29 int main()
  30 {
  31    one;         // expected-warning {{expression result unused}}
  32    two;         // expected-error {{reference to overloaded function could not be resolved; did you mean to call it with no arguments?}}
  33    oneT<int>;  // expected-warning {{expression result unused}}
  34    twoT<int>;  // expected-error {{reference to overloaded function could not be resolved; did you mean to call it?}}
  35    typeid(oneT<int>); // expected-warning{{expression result unused}}
  36   sizeof(oneT<int>); // expected-error {{invalid application of 'sizeof' to a function type}}
  37   sizeof(twoT<int>); //expected-error {{reference to overloaded function could not be resolved; did you mean to call it?}}
  38   decltype(oneT<int>)* fun = 0;
  39
  40   *one;    // expected-warning {{expression result unused}}
  41   *oneT<int>;   // expected-warning {{expression result unused}}
  42   *two;  //expected-error {{reference to overloaded function could not be resolved; did you mean to call it with no arguments?}} expected-error {{indirection requires pointer operand}}
  43   *twoT<int>; //expected-error {{reference to overloaded function could not be resolved; did you mean to call it?}}
  44   !oneT<int>;  // expected-warning {{expression result unused}} expected-warning {{address of function 'oneT<int>' will always evaluate to 'true'}} expected-note {{prefix with the address-of operator to silence this warning}}
  45   +oneT<int>;  // expected-warning {{expression result unused}}
  46   -oneT<int>;  //expected-error {{invalid argument type}}
  47   oneT<int> == 0;   // expected-warning {{equality comparison result unused}} \
  48                     // expected-note {{use '=' to turn this equality comparison into an assignment}} \
  49                     // expected-warning {{comparison of function 'oneT<int>' equal to a null pointer is always false}} \
  50                     // expected-note {{prefix with the address-of operator to silence this warning}}
  51   0 == oneT<int>;   // expected-warning {{equality comparison result unused}} \
  52                     // expected-warning {{comparison of function 'oneT<int>' equal to a null pointer is always false}} \
  53                     // expected-note {{prefix with the address-of operator to silence this warning}}
  54   0 != oneT<int>;   // expected-warning {{inequality comparison result unused}} \
  55                     // expected-warning {{comparison of function 'oneT<int>' not equal to a null pointer is always true}} \
  56                     // expected-note {{prefix with the address-of operator to silence this warning}}
  57   (false ? one : oneT<int>);   // expected-warning {{expression result unused}}
  58   void (*p1)(int); p1 = oneT<int>;
  59
  60   int i = (int) (false ? (void (*)(int))twoT<int> : oneT<int>); //expected-error {{incompatible operand}}
  61   (twoT<int>) == oneT<int>; //expected-error {{reference to overloaded function could not be resolved; did you mean to call it?}} {{cannot resolve overloaded function 'twoT' from context}}
  62   bool b = oneT<int>; // expected-warning {{address of function 'oneT<int>' will always evaluate to 'true'}} expected-note {{prefix with the address-of operator to silence this warning}}
  63   void (*p)() = oneT<int>;
  64   test<oneT<int> > ti;
  65   void (*u)(int) = oneT<int>;
  66
  67   b = (void (*)()) twoT<int>;
  68
  69   one < one; // expected-warning {{self-comparison always evaluates to false}} \
  70              // expected-warning {{relational comparison result unused}}       \
  71              // expected-warning {{ordered comparison of function pointers}}
  72
  73   oneT<int> < oneT<int>; // expected-warning {{self-comparison always evaluates to false}} \
  74                          // expected-warning {{relational comparison result unused}}       \
  75                          // expected-warning {{ordered comparison of function pointers}}
  76
  77   two < two; //expected-error 2 {{reference to overloaded function could not be resolved; did you mean to call it with no arguments?}} expected-error {{invalid operands to binary expression ('void' and 'void')}}
  78   twoT<int> < twoT<int>; //expected-error {{reference to overloaded function could not be resolved; did you mean to call it?}} {{cannot resolve overloaded function 'twoT' from context}}
  79   oneT<int> == 0;   // expected-warning {{equality comparison result unused}} \
  80                     // expected-note {{use '=' to turn this equality comparison into an assignment}} \
  81                     // expected-warning {{comparison of function 'oneT<int>' equal to a null pointer is always false}} \
  82                     // expected-note {{prefix with the address-of operator to silence this warning}}
  83
  84 }
  85
  86 struct rdar9108698 {
  87   template<typename> void f(); // expected-note{{possible target for call}}
  88 };
  89
  90 void test_rdar9108698(rdar9108698 x) {
  91   x.f<int>; // expected-error{{reference to non-static member function must be called}}
  92 }
  93
  94 namespace GCC_PR67898 {
  95   void f(int);
  96   void f(float);
  97   template<typename T, T F, T G, bool b = F == G> struct X {
  98     static_assert(b, "");
  99   };
 100   template<typename T> void test1() { X<void(T), f, f>(); }
 101   template<typename T> void test2() { X<void(*)(T), f, f>(); }
 102   template void test1<int>();
 103   template void test2<int>();
 104 }