1 files changed, 260 insertions, 0 deletions
diff --git a/clang/test/CXX/temp/temp.decls/temp.variadic/example-tuple.cpp b/clang/test/CXX/temp/temp.decls/temp.variadic/example-tuple.cpp
new file mode 100644
index 0000000..9de5fa8
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+++ b/clang/test/CXX/temp/temp.decls/temp.variadic/example-tuple.cpp
@@ -0,0 +1,260 @@
+// RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s
+
+// Example tuple implementation from the variadic templates proposal,
+// ISO C++ committee document number N2080.
+
+// Helper type traits
+template<typename T>
+struct add_reference {
+  typedef T &type;
+};
+
+template<typename T>
+struct add_reference<T&> {
+  typedef T &type;
+};
+
+template<typename T>
+struct add_const_reference {
+  typedef T const &type;
+};
+
+template<typename T>
+struct add_const_reference<T&> {
+  typedef T &type;
+};
+
+template<typename T, typename U>
+struct is_same {
+  static const bool value = false;
+};
+
+template<typename T>
+struct is_same<T, T> {
+  static const bool value = true;
+};
+
+template<typename T> 
+class reference_wrapper { 
+  T *ptr;
+
+public:
+  reference_wrapper(T& t) : ptr(&t) { }
+  operator T&() const { return *ptr; }
+};
+
+template<typename T> reference_wrapper<T> ref(T& t) { 
+  return reference_wrapper<T>(t); 
+}
+template<typename T> reference_wrapper<const T> cref(const T& t) {
+  return reference_wrapper<const T>(t); 
+}
+
+template<typename... Values> class tuple;
+
+// Basis case: zero-length tuple
+template<> class tuple<> { };
+
+template<typename Head, typename... Tail> 
+class tuple<Head, Tail...> : private tuple<Tail...> { 
+  typedef tuple<Tail...> inherited;
+
+public: 
+  tuple() { }
+  // implicit copy-constructor is okay
+
+  // Construct tuple from separate arguments. 
+  tuple(typename add_const_reference<Head>::type v,
+        typename add_const_reference<Tail>::type... vtail) 
+    : m_head(v), inherited(vtail...) { }
+
+  // Construct tuple from another tuple. 
+  template<typename... VValues> tuple(const tuple<VValues...>& other)
+    : m_head(other.head()), inherited(other.tail()) { }
+
+  template<typename... VValues> tuple& 
+  operator=(const tuple<VValues...>& other) {
+    m_head = other.head(); 
+    tail() = other.tail(); 
+    return *this;
+  }
+
+  typename add_reference<Head>::type head() { return m_head; } 
+  typename add_reference<const Head>::type head() const { return m_head; }
+  inherited& tail() { return *this; } 
+  const inherited& tail() const { return *this; }
+
+protected: 
+  Head m_head;
+};
+
+void test_tuple() {
+  tuple<> t0a;
+  tuple<> t0b(t0a);
+  t0a = t0b;
+
+  tuple<int> t1a;
+  tuple<int> t1b(17);
+  tuple<int> t1c(t1b);
+  t1a = t1b;
+
+  tuple<float> t1d(3.14159);
+  tuple<float> t1e(t1d);
+  t1d = t1e;
+
+  int i;
+  float f;
+  double d;
+  tuple<int*, float*, double*> t3a(&i, &f, &d);
+}
+
+// Creation functions
+template<typename T> 
+struct make_tuple_result {
+  typedef T type;
+};
+
+template<typename T> 
+struct make_tuple_result<reference_wrapper<T> > {
+  typedef T& type;
+};
+
+template<typename... Values> 
+tuple<typename make_tuple_result<Values>::type...> 
+make_tuple(const Values&... values) {
+  return tuple<typename make_tuple_result<Values>::type...>(values...);
+}
+
+template<typename... Values> 
+tuple<Values&...> tie(Values&... values) {
+  return tuple<Values&...>(values...);
+}
+
+template<typename T> const T *addr(const T& ref) { return &ref; }
+void test_creation_functions() {
+  int i;
+  float f;
+  double d;
+  const tuple<int, float&, const double&> *t3p = addr(make_tuple(i, ref(f), cref(d)));
+  const tuple<int&, float&, double&> *t3q = addr(tie(i, f, d));
+}
+
+// Helper classes
+template<typename Tuple> struct tuple_size;
+
+template<typename... Values> struct tuple_size<tuple<Values...> > {
+  static const int value = sizeof...(Values);
+};
+
+int check_tuple_size_0[tuple_size<tuple<> >::value == 0? 1 : -1];
+int check_tuple_size_1[tuple_size<tuple<int>>::value == 1? 1 : -1];
+int check_tuple_size_2[tuple_size<tuple<float, double>>::value == 2? 1 : -1];
+int check_tuple_size_3[tuple_size<tuple<char, unsigned char, signed char>>::value == 3? 1 : -1];
+
+template<int I, typename Tuple> struct tuple_element;
+
+template<int I, typename Head, typename... Tail> 
+struct tuple_element<I, tuple<Head, Tail...> > {
+  typedef typename tuple_element<I-1, tuple<Tail...> >::type type;
+};
+
+template<typename Head, typename... Tail> 
+struct tuple_element<0, tuple<Head, Tail...> > {
+  typedef Head type;
+};
+
+int check_tuple_element_0[is_same<tuple_element<0, tuple<int&, float, double>>::type,
+                                  int&>::value? 1 : -1];
+
+int check_tuple_element_1[is_same<tuple_element<1, tuple<int&, float, double>>::type,
+                                  float>::value? 1 : -1];
+
+int check_tuple_element_2[is_same<tuple_element<2, tuple<int&, float, double>>::type,
+                                  double>::value? 1 : -1];
+
+// Element access
+template<int I, typename Tuple> class get_impl;
+template<int I, typename Head, typename... Values> 
+class get_impl<I, tuple<Head, Values...> > {
+  typedef typename tuple_element<I-1, tuple<Values...> >::type Element;
+  typedef typename add_reference<Element>::type RJ; 
+  typedef typename add_const_reference<Element>::type PJ;
+  typedef get_impl<I-1, tuple<Values...> > Next;
+public: 
+  static RJ get(tuple<Head, Values...>& t) { return Next::get(t.tail()); }
+  static PJ get(const tuple<Head, Values...>& t) { return Next::get(t.tail()); }
+};
+
+template<typename Head, typename... Values> 
+class get_impl<0, tuple<Head, Values...> > {
+  typedef typename add_reference<Head>::type RJ; 
+  typedef typename add_const_reference<Head>::type PJ;
+public: 
+  static RJ get(tuple<Head, Values...>& t) { return t.head(); } 
+  static PJ get(const tuple<Head, Values...>& t) { return t.head(); }
+};
+
+template<int I, typename... Values> typename add_reference<
+typename tuple_element<I, tuple<Values...> >::type >::type
+get(tuple<Values...>& t) { 
+  return get_impl<I, tuple<Values...> >::get(t);
+}
+
+template<int I, typename... Values> typename add_const_reference<
+typename tuple_element<I, tuple<Values...> >::type >::type
+get(const tuple<Values...>& t) { 
+  return get_impl<I, tuple<Values...> >::get(t);
+}
+
+void test_element_access(tuple<int*, float*, double*&> t3) {
+  int i;
+  float f;
+  double d;
+  get<0>(t3) = &i;
+  get<1>(t3) = &f;
+  get<2>(t3) = &d;
+}
+
+// Relational operators
+inline bool operator==(const tuple<>&, const tuple<>&) { return true; }
+
+template<typename T, typename... TTail, typename U, typename... UTail> 
+bool operator==(const tuple<T, TTail...>& t, const tuple<U, UTail...>& u) {
+  return t.head() == u.head() && t.tail() == u.tail();
+}
+
+template<typename... TValues, typename... UValues> 
+bool operator!=(const tuple<TValues...>& t, const tuple<UValues...>& u) {
+  return !(t == u); 
+}
+
+inline bool operator<(const tuple<>&, const tuple<>&) { return false; }
+
+template<typename T, typename... TTail, typename U, typename... UTail> 
+bool operator<(const tuple<T, TTail...>& t, const tuple<U, UTail...>& u) {
+  return (t.head() < u.head() || (!(t.head() < u.head()) && t.tail() < u.tail()));
+}
+
+template<typename... TValues, typename... UValues> 
+bool operator>(const tuple<TValues...>& t, const tuple<UValues...>& u) {
+  return u < t;
+}
+
+template<typename... TValues, typename... UValues>
+bool operator<=(const tuple<TValues...>& t, const tuple<UValues...>& u) {
+  return !(u < t);
+}
+
+template<typename... TValues, typename... UValues>
+bool operator>=(const tuple<TValues...>& t, const tuple<UValues...>& u) {
+  return !(t < u);
+}
+
+void test_relational_operators(tuple<int*, float*, double*> t3) {
+  (void)(t3 == t3);
+  (void)(t3 != t3);
+  (void)(t3 < t3);
+  (void)(t3 <= t3);
+  (void)(t3 >= t3);
+  (void)(t3 > t3);
+};