clang/test/SemaTemplate/instantiate-template-template-parm.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -verify %s
   2 template<template<typename T> class MetaFun, typename Value>
   3 struct apply {
   4   typedef typename MetaFun<Value>::type type;
   5 };
   6
   7 template<class T>
   8 struct add_pointer {
   9   typedef T* type;
  10 };
  11
  12 template<class T>
  13 struct add_reference {
  14   typedef T& type;
  15 };
  16
  17 int i;
  18 apply<add_pointer, int>::type ip = &i;
  19 apply<add_reference, int>::type ir = i;
  20 apply<add_reference, float>::type fr = i; // expected-error{{non-const lvalue reference to type 'float' cannot bind to a value of unrelated type 'int'}}
  21
  22 // Template template parameters
  23 template<int> struct B; // expected-note{{has a different type 'int'}}
  24
  25 template<typename T,
  26          template<T Value> class X> // expected-error{{cannot have type 'float'}} \
  27                                     // expected-note{{with type 'long'}}
  28 struct X0 { };
  29
  30 X0<int, B> x0b1;
  31 X0<float, B> x0b2; // expected-note{{while substituting}}
  32 X0<long, B> x0b3; // expected-error{{template template argument has different template parameters}}
  33
  34 template<template<int V> class TT> // expected-note{{parameter with type 'int'}}
  35 struct X1 { };
  36
  37 template<typename T, template<T V> class TT>
  38 struct X2 {
  39   X1<TT> x1; // expected-error{{has different template parameters}}
  40 };
  41
  42 template<int V> struct X3i { };
  43 template<long V> struct X3l { }; // expected-note{{different type 'long'}}
  44
  45 X2<int, X3i> x2okay;
  46 X2<long, X3l> x2bad; // expected-note{{instantiation}}
  47
  48 template <typename T, template <T, T> class TT, class R = TT<1, 2> >
  49 struct Comp {
  50   typedef R r1;
  51   template <T x, T y> struct gt {
  52     static const bool result = x > y;
  53   };
  54   typedef gt<2, 1> r2;
  55 };
  56
  57 template <int x, int y> struct lt {
  58   static const bool result = x < y;
  59 };
  60
  61 Comp<int, lt> c0;
  62
  63 namespace PR8629 {
  64   template<template<int> class TT> struct X0
  65   {
  66     static void apply();
  67   };
  68   template<int> struct Type { };
  69
  70   template<class T> struct X1
  71   {
  72     template<class U> struct Inner;
  73
  74     template<class U> void g()
  75     {
  76       typedef Inner<U> Init;
  77       X0<Init::template VeryInner>::apply();
  78     }
  79     template<int N> void f ()
  80     {
  81       g<Type<N> >();
  82     }
  83   };
  84   template<class T> template<class U> struct X1<T>::Inner
  85   {
  86     template<int> struct VeryInner {
  87     };
  88   };
  89   struct X1Container
  90   {
  91     X1Container()
  92     {
  93       simplex_.f<0>();
  94     }
  95     X1<double> simplex_;
  96   };
  97 }