test/SemaTemplate/metafun-apply.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -verify %s
   2
   3 struct add_pointer {
   4   template<typename T>
   5   struct apply {
   6     typedef T* type;
   7   };
   8 };
   9
  10 struct add_reference {
  11   template<typename T>
  12   struct apply {
  13     typedef T& type; // expected-error{{cannot form a reference to 'void'}}
  14   };
  15 };
  16
  17 struct bogus {
  18   struct apply {
  19     typedef int type;
  20   };
  21 };
  22
  23 template<typename MetaFun, typename T>
  24 struct apply1 {
  25   typedef typename MetaFun::template apply<T>::type type; // expected-note{{in instantiation of template class 'add_reference::apply<void>' requested here}} \
  26   // expected-error{{'apply' following the 'template' keyword does not refer to a template}}
  27 };
  28
  29 int i;
  30 apply1<add_pointer, int>::type ip = &i;
  31 apply1<add_reference, int>::type ir = i;
  32 apply1<add_reference, float>::type fr = i; // expected-error{{non-const lvalue reference to type 'float' cannot bind to a value of unrelated type 'int'}}
  33
  34 void test() {
  35   apply1<add_reference, void>::type t; // expected-note{{in instantiation of template class 'apply1<add_reference, void>' requested here}}
  36
  37   apply1<bogus, int>::type t2; // expected-note{{in instantiation of template class 'apply1<bogus, int>' requested here}}
  38 }
  39
  40