[cfe-commits] r123016 - /cfe/trunk/test/CXX/temp/temp.decls/temp.variadic/example-tuple.cpp
Douglas Gregor
dgregor at apple.com
Fri Jan 7 11:37:08 PST 2011
Author: dgregor
Date: Fri Jan 7 13:37:08 2011
New Revision: 123016
URL: http://llvm.org/viewvc/llvm-project?rev=123016&view=rev
Log:
Variadic templates example: a nearly-complete implementation of a TR1
tuple class template. This implementation is boosted directly from the
variadic templates proposal. N2080.
Note that one section is #ifdef'd out. I'll implement that aspect of
template argument deduction next.
Added:
cfe/trunk/test/CXX/temp/temp.decls/temp.variadic/example-tuple.cpp
Added: cfe/trunk/test/CXX/temp/temp.decls/temp.variadic/example-tuple.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CXX/temp/temp.decls/temp.variadic/example-tuple.cpp?rev=123016&view=auto
==============================================================================
--- cfe/trunk/test/CXX/temp/temp.decls/temp.variadic/example-tuple.cpp (added)
+++ cfe/trunk/test/CXX/temp/temp.decls/temp.variadic/example-tuple.cpp Fri Jan 7 13:37:08 2011
@@ -0,0 +1,264 @@
+// RUN: %clang_cc1 -std=c++0x -fsyntax-only -verify %s
+
+// Example tuple implementation from the variadic templates proposal,
+// ISO C++ committee document nmber 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);
+}
+
+#if 0
+// FIXME: Not yet functional, because we aren't currently able to
+// extend a partially-explicitly-specified parameter pack.
+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;
+}
+#endif
+
+// 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);
+};
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