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;
  24
  25 template<typename T,
  26          template<T Value> class X> // expected-error{{cannot have type 'float'}}
  27 struct X0 { };
  28
  29 X0<int, B> x0b1;
  30 X0<float, B> x0b2; // expected-note{{while substituting}}
  31 X0<long, B> x0b3;
  32
  33 template<template<int V> class TT>
  34 struct X1 { };
  35
  36 template<typename T, template<T V> class TT>
  37 struct X2 {
  38   X1<TT> x1;
  39 };
  40
  41 template<int V> struct X3i { };
  42 template<long V> struct X3l { };
  43
  44 X2<int, X3i> x2okay;
  45 X2<long, X3l> x2okay2;
  46
  47 template <typename T, template <T, T> class TT, class R = TT<1, 2> >
  48 struct Comp {
  49   typedef R r1;
  50   template <T x, T y> struct gt {
  51     static const bool result = x > y;
  52   };
  53   typedef gt<2, 1> r2;
  54 };
  55
  56 template <int x, int y> struct lt {
  57   static const bool result = x < y;
  58 };
  59
  60 Comp<int, lt> c0;
  61
  62 namespace PR8629 {
  63   template<template<int> class TT> struct X0
  64   {
  65     static void apply();
  66   };
  67   template<int> struct Type { };
  68
  69   template<class T> struct X1
  70   {
  71     template<class U> struct Inner;
  72
  73     template<class U> void g()
  74     {
  75       typedef Inner<U> Init;
  76       X0<Init::template VeryInner>::apply();
  77     }
  78     template<int N> void f ()
  79     {
  80       g<Type<N> >();
  81     }
  82   };
  83   template<class T> template<class U> struct X1<T>::Inner
  84   {
  85     template<int> struct VeryInner {
  86     };
  87   };
  88   struct X1Container
  89   {
  90     X1Container()
  91     {
  92       simplex_.f<0>();
  93     }
  94     X1<double> simplex_;
  95   };
  96 }