clang/test/SemaTemplate/temp_arg.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -verify=expected,precxx17 %std_cxx98-14 %s
   2 // RUN: %clang_cc1 -fsyntax-only -verify=expected,cxx17 %std_cxx17- %s
   3 template<typename T,
   4          int I,
   5          template<typename> class TT>
   6   class A; // precxx17-note 3 {{template is declared here}} \
   7               cxx17-note 2 {{template is declared here}} \
   8               cxx17-note {{candidate template ignored: couldn't infer template argument 'T'}} \
   9               cxx17-note {{implicit deduction guide declared as 'template <typename T, int I, template <typename> class TT> A(A<T, I, TT>) -> A<T, I, TT>'}} \
  10               cxx17-note {{candidate function template not viable: requires 1 argument, but 0 were provided}} \
  11               cxx17-note {{implicit deduction guide declared as 'template <typename T, int I, template <typename> class TT> A() -> A<T, I, TT>'}} \
  12
  13 template<typename> class X;
  14
  15 A<int, 0, X> * a1;
  16
  17 A<float, 1, X, double> *a2; // expected-error{{too many template arguments for class template 'A'}}
  18 A<float, 1> *a3; // expected-error{{too few template arguments for class template 'A'}}
  19 A a4; // precxx17-error{{use of class template 'A' requires template arguments}} \
  20          cxx17-error{{no viable constructor or deduction guide for deduction of template arguments of 'A'}}
  21
  22 namespace test0 {
  23   template <class t> class foo {};
  24   template <class t> class bar {
  25     bar(::test0::foo<tee> *ptr) {} // expected-error {{use of undeclared identifier 'tee'}}
  26   };
  27 }