clang/test/CXX/temp/temp.param/p11-0x.cpp

   1 // RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s
   2
   3 // If a template-parameter of a class template or alias template has a default
   4 // template-argument, each subsequent template-parameter shall either have a
   5 // default template-argument supplied or be a template parameter pack.
   6 template<typename> struct vector;
   7
   8 template<typename T = int, typename> struct X3t; // expected-error{{template parameter missing a default argument}} expected-note{{previous default template argument defined here}}
   9 template<typename T = int, typename> using A3t = int; // expected-error{{template parameter missing a default argument}} expected-note{{previous default template argument defined here}}
  10 template<int V = 0, int> struct X3nt; // expected-error{{template parameter missing a default argument}} expected-note{{previous default template argument defined here}}
  11 template<int V = 0, int> using A3nt = int; // expected-error{{template parameter missing a default argument}} expected-note{{previous default template argument defined here}}
  12 template<template<class> class M = vector, template<class> class> struct X3tt; // expected-error{{template parameter missing a default argument}} expected-note{{previous default template argument defined here}}
  13 template<template<class> class M = vector, template<class> class> using A3tt = int; // expected-error{{template parameter missing a default argument}} expected-note{{previous default template argument defined here}}
  14
  15 template<typename T = int, typename ...Types> struct X2t;
  16 template<typename T = int, typename ...Types> using A2t = X2t<T, Types...>;
  17 template<int V = 0, int ...Values> struct X2nt;
  18 template<int V = 0, int ...Values> using A2nt = X2nt<V, Values...>;
  19 template<template<class> class M = vector, template<class> class... Metas>
  20   struct X2tt;
  21 template<template<class> class M = vector, template<class> class... Metas>
  22   using A2tt = X2tt<M, Metas...>;
  23
  24 // If a template-parameter of a primary class template or alias template is a
  25 // template parameter pack, it shall be the last template-parameter.
  26 template<typename ...Types, // expected-error{{template parameter pack must be the last template parameter}}
  27          int After, int After2>
  28 struct X0t;
  29 X0t<int> pr9789();
  30 template<typename ...Types, // expected-error{{template parameter pack must be the last template parameter}}
  31          int After>
  32 using A0t = int;
  33
  34 template<int ...Values, // expected-error{{template parameter pack must be the last template parameter}}
  35          int After>
  36 struct X0nt;
  37 template<int ...Values, // expected-error{{template parameter pack must be the last template parameter}}
  38          int After>
  39 using A0nt = int;
  40
  41 template<template<typename> class ...Templates, // expected-error{{template parameter pack must be the last template parameter}}
  42          int After>
  43 struct X0tt;
  44 template<template<typename> class ...Templates, // expected-error{{template parameter pack must be the last template parameter}}
  45          int After>
  46 using A0tt = int;
  47
  48 // [ Note: These are not requirements for function templates or class
  49 // template partial specializations because template arguments can be
  50 // deduced (14.8.2). -- end note]
  51 template<typename... Types> struct X1t;
  52 template<typename ...Types, typename T> struct X1t<T, Types...> { };
  53
  54 template<int... Values> struct X1nt;
  55 template<int ...Values, int V> struct X1nt<V, Values...> { };
  56
  57 template<template<int> class... Meta> struct X1tt;
  58 template<template<int> class... Meta, template<int> class M>
  59   struct X1tt<M, Meta...> { };
  60
  61 template<typename ...Types, typename T>
  62 void f1t(X1t<T, Types...>);
  63
  64 template<int ...Values, int V>
  65 void f1nt(X1nt<V, Values...>);
  66
  67 template<template<int> class... Meta, template<int> class M>
  68 void f1tt(X1tt<M, Meta...>);
  69
  70 namespace DefaultTemplateArgsInFunction {
  71   template<typename T = int, typename U>  T &f0(U) { T *x = 0; return *x; }
  72
  73   void test_f0() {
  74     int &ir0 = f0(3.14159);
  75     int &ir1 = f0<int>(3.14159);
  76     float &fr0 = f0<float>(3.14159);
  77   }
  78
  79   template<> int &f0(int*);
  80   template int &f0(double&);
  81 }