19ca5c425SRichard Smith // RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s
2*c6e68daaSAndy Gibbs // expected-no-diagnostics
3fe6e33a3SDouglas Gregor
4fe6e33a3SDouglas Gregor // Example tuple implementation from the variadic templates proposal,
5b41e2d92SDouglas Gregor // ISO C++ committee document number N2080.
6fe6e33a3SDouglas Gregor
7fe6e33a3SDouglas Gregor // Helper type traits
8fe6e33a3SDouglas Gregor template<typename T>
9fe6e33a3SDouglas Gregor struct add_reference {
10fe6e33a3SDouglas Gregor typedef T &type;
11fe6e33a3SDouglas Gregor };
12fe6e33a3SDouglas Gregor
13fe6e33a3SDouglas Gregor template<typename T>
14fe6e33a3SDouglas Gregor struct add_reference<T&> {
15fe6e33a3SDouglas Gregor typedef T &type;
16fe6e33a3SDouglas Gregor };
17fe6e33a3SDouglas Gregor
18fe6e33a3SDouglas Gregor template<typename T>
19fe6e33a3SDouglas Gregor struct add_const_reference {
20fe6e33a3SDouglas Gregor typedef T const &type;
21fe6e33a3SDouglas Gregor };
22fe6e33a3SDouglas Gregor
23fe6e33a3SDouglas Gregor template<typename T>
24fe6e33a3SDouglas Gregor struct add_const_reference<T&> {
25fe6e33a3SDouglas Gregor typedef T &type;
26fe6e33a3SDouglas Gregor };
27fe6e33a3SDouglas Gregor
28fe6e33a3SDouglas Gregor template<typename T, typename U>
29fe6e33a3SDouglas Gregor struct is_same {
30fe6e33a3SDouglas Gregor static const bool value = false;
31fe6e33a3SDouglas Gregor };
32fe6e33a3SDouglas Gregor
33fe6e33a3SDouglas Gregor template<typename T>
34fe6e33a3SDouglas Gregor struct is_same<T, T> {
35fe6e33a3SDouglas Gregor static const bool value = true;
36fe6e33a3SDouglas Gregor };
37fe6e33a3SDouglas Gregor
38fe6e33a3SDouglas Gregor template<typename T>
39fe6e33a3SDouglas Gregor class reference_wrapper {
40fe6e33a3SDouglas Gregor T *ptr;
41fe6e33a3SDouglas Gregor
42fe6e33a3SDouglas Gregor public:
reference_wrapper(T & t)43fe6e33a3SDouglas Gregor reference_wrapper(T& t) : ptr(&t) { }
operator T&() const44fe6e33a3SDouglas Gregor operator T&() const { return *ptr; }
45fe6e33a3SDouglas Gregor };
46fe6e33a3SDouglas Gregor
ref(T & t)47fe6e33a3SDouglas Gregor template<typename T> reference_wrapper<T> ref(T& t) {
48fe6e33a3SDouglas Gregor return reference_wrapper<T>(t);
49fe6e33a3SDouglas Gregor }
cref(const T & t)50fe6e33a3SDouglas Gregor template<typename T> reference_wrapper<const T> cref(const T& t) {
51fe6e33a3SDouglas Gregor return reference_wrapper<const T>(t);
52fe6e33a3SDouglas Gregor }
53fe6e33a3SDouglas Gregor
54fe6e33a3SDouglas Gregor template<typename... Values> class tuple;
55fe6e33a3SDouglas Gregor
56fe6e33a3SDouglas Gregor // Basis case: zero-length tuple
57fe6e33a3SDouglas Gregor template<> class tuple<> { };
58fe6e33a3SDouglas Gregor
59fe6e33a3SDouglas Gregor template<typename Head, typename... Tail>
60fe6e33a3SDouglas Gregor class tuple<Head, Tail...> : private tuple<Tail...> {
61fe6e33a3SDouglas Gregor typedef tuple<Tail...> inherited;
62fe6e33a3SDouglas Gregor
63fe6e33a3SDouglas Gregor public:
tuple()64fe6e33a3SDouglas Gregor tuple() { }
65fe6e33a3SDouglas Gregor // implicit copy-constructor is okay
66fe6e33a3SDouglas Gregor
67fe6e33a3SDouglas Gregor // Construct tuple from separate arguments.
tuple(typename add_const_reference<Head>::type v,typename add_const_reference<Tail>::type...vtail)68fe6e33a3SDouglas Gregor tuple(typename add_const_reference<Head>::type v,
69fe6e33a3SDouglas Gregor typename add_const_reference<Tail>::type... vtail)
70fe6e33a3SDouglas Gregor : m_head(v), inherited(vtail...) { }
71fe6e33a3SDouglas Gregor
72fe6e33a3SDouglas Gregor // Construct tuple from another tuple.
tuple(const tuple<VValues...> & other)73fe6e33a3SDouglas Gregor template<typename... VValues> tuple(const tuple<VValues...>& other)
74fe6e33a3SDouglas Gregor : m_head(other.head()), inherited(other.tail()) { }
75fe6e33a3SDouglas Gregor
76fe6e33a3SDouglas Gregor template<typename... VValues> tuple&
operator =(const tuple<VValues...> & other)77fe6e33a3SDouglas Gregor operator=(const tuple<VValues...>& other) {
78fe6e33a3SDouglas Gregor m_head = other.head();
79fe6e33a3SDouglas Gregor tail() = other.tail();
80fe6e33a3SDouglas Gregor return *this;
81fe6e33a3SDouglas Gregor }
82fe6e33a3SDouglas Gregor
head()83fe6e33a3SDouglas Gregor typename add_reference<Head>::type head() { return m_head; }
head() const84fe6e33a3SDouglas Gregor typename add_reference<const Head>::type head() const { return m_head; }
tail()85fe6e33a3SDouglas Gregor inherited& tail() { return *this; }
tail() const86fe6e33a3SDouglas Gregor const inherited& tail() const { return *this; }
87fe6e33a3SDouglas Gregor
88fe6e33a3SDouglas Gregor protected:
89fe6e33a3SDouglas Gregor Head m_head;
90fe6e33a3SDouglas Gregor };
91fe6e33a3SDouglas Gregor
test_tuple()92fe6e33a3SDouglas Gregor void test_tuple() {
93fe6e33a3SDouglas Gregor tuple<> t0a;
94fe6e33a3SDouglas Gregor tuple<> t0b(t0a);
95fe6e33a3SDouglas Gregor t0a = t0b;
96fe6e33a3SDouglas Gregor
97fe6e33a3SDouglas Gregor tuple<int> t1a;
98fe6e33a3SDouglas Gregor tuple<int> t1b(17);
99fe6e33a3SDouglas Gregor tuple<int> t1c(t1b);
100fe6e33a3SDouglas Gregor t1a = t1b;
101fe6e33a3SDouglas Gregor
102fe6e33a3SDouglas Gregor tuple<float> t1d(3.14159);
103fe6e33a3SDouglas Gregor tuple<float> t1e(t1d);
104fe6e33a3SDouglas Gregor t1d = t1e;
105fe6e33a3SDouglas Gregor
106fe6e33a3SDouglas Gregor int i;
107fe6e33a3SDouglas Gregor float f;
108fe6e33a3SDouglas Gregor double d;
109fe6e33a3SDouglas Gregor tuple<int*, float*, double*> t3a(&i, &f, &d);
110fe6e33a3SDouglas Gregor }
111fe6e33a3SDouglas Gregor
112fe6e33a3SDouglas Gregor // Creation functions
113fe6e33a3SDouglas Gregor template<typename T>
114fe6e33a3SDouglas Gregor struct make_tuple_result {
115fe6e33a3SDouglas Gregor typedef T type;
116fe6e33a3SDouglas Gregor };
117fe6e33a3SDouglas Gregor
118fe6e33a3SDouglas Gregor template<typename T>
119fe6e33a3SDouglas Gregor struct make_tuple_result<reference_wrapper<T> > {
120fe6e33a3SDouglas Gregor typedef T& type;
121fe6e33a3SDouglas Gregor };
122fe6e33a3SDouglas Gregor
123fe6e33a3SDouglas Gregor template<typename... Values>
124fe6e33a3SDouglas Gregor tuple<typename make_tuple_result<Values>::type...>
make_tuple(const Values &...values)125fe6e33a3SDouglas Gregor make_tuple(const Values&... values) {
126fe6e33a3SDouglas Gregor return tuple<typename make_tuple_result<Values>::type...>(values...);
127fe6e33a3SDouglas Gregor }
128fe6e33a3SDouglas Gregor
129fe6e33a3SDouglas Gregor template<typename... Values>
tie(Values &...values)130fe6e33a3SDouglas Gregor tuple<Values&...> tie(Values&... values) {
131fe6e33a3SDouglas Gregor return tuple<Values&...>(values...);
132fe6e33a3SDouglas Gregor }
133fe6e33a3SDouglas Gregor
addr(const T & ref)134fe6e33a3SDouglas Gregor template<typename T> const T *addr(const T& ref) { return &ref; }
test_creation_functions()135fe6e33a3SDouglas Gregor void test_creation_functions() {
136fe6e33a3SDouglas Gregor int i;
137fe6e33a3SDouglas Gregor float f;
138fe6e33a3SDouglas Gregor double d;
139fe6e33a3SDouglas Gregor const tuple<int, float&, const double&> *t3p = addr(make_tuple(i, ref(f), cref(d)));
140fe6e33a3SDouglas Gregor const tuple<int&, float&, double&> *t3q = addr(tie(i, f, d));
141fe6e33a3SDouglas Gregor }
142fe6e33a3SDouglas Gregor
143fe6e33a3SDouglas Gregor // Helper classes
144fe6e33a3SDouglas Gregor template<typename Tuple> struct tuple_size;
145fe6e33a3SDouglas Gregor
146fe6e33a3SDouglas Gregor template<typename... Values> struct tuple_size<tuple<Values...> > {
147fe6e33a3SDouglas Gregor static const int value = sizeof...(Values);
148fe6e33a3SDouglas Gregor };
149fe6e33a3SDouglas Gregor
150fe6e33a3SDouglas Gregor int check_tuple_size_0[tuple_size<tuple<> >::value == 0? 1 : -1];
151fe6e33a3SDouglas Gregor int check_tuple_size_1[tuple_size<tuple<int>>::value == 1? 1 : -1];
152fe6e33a3SDouglas Gregor int check_tuple_size_2[tuple_size<tuple<float, double>>::value == 2? 1 : -1];
153fe6e33a3SDouglas Gregor int check_tuple_size_3[tuple_size<tuple<char, unsigned char, signed char>>::value == 3? 1 : -1];
154fe6e33a3SDouglas Gregor
155fe6e33a3SDouglas Gregor template<int I, typename Tuple> struct tuple_element;
156fe6e33a3SDouglas Gregor
157fe6e33a3SDouglas Gregor template<int I, typename Head, typename... Tail>
158fe6e33a3SDouglas Gregor struct tuple_element<I, tuple<Head, Tail...> > {
159fe6e33a3SDouglas Gregor typedef typename tuple_element<I-1, tuple<Tail...> >::type type;
160fe6e33a3SDouglas Gregor };
161fe6e33a3SDouglas Gregor
162fe6e33a3SDouglas Gregor template<typename Head, typename... Tail>
163fe6e33a3SDouglas Gregor struct tuple_element<0, tuple<Head, Tail...> > {
164fe6e33a3SDouglas Gregor typedef Head type;
165fe6e33a3SDouglas Gregor };
166fe6e33a3SDouglas Gregor
167fe6e33a3SDouglas Gregor int check_tuple_element_0[is_same<tuple_element<0, tuple<int&, float, double>>::type,
168fe6e33a3SDouglas Gregor int&>::value? 1 : -1];
169fe6e33a3SDouglas Gregor
170fe6e33a3SDouglas Gregor int check_tuple_element_1[is_same<tuple_element<1, tuple<int&, float, double>>::type,
171fe6e33a3SDouglas Gregor float>::value? 1 : -1];
172fe6e33a3SDouglas Gregor
173fe6e33a3SDouglas Gregor int check_tuple_element_2[is_same<tuple_element<2, tuple<int&, float, double>>::type,
174fe6e33a3SDouglas Gregor double>::value? 1 : -1];
175fe6e33a3SDouglas Gregor
176fe6e33a3SDouglas Gregor // Element access
177fe6e33a3SDouglas Gregor template<int I, typename Tuple> class get_impl;
178fe6e33a3SDouglas Gregor template<int I, typename Head, typename... Values>
179fe6e33a3SDouglas Gregor class get_impl<I, tuple<Head, Values...> > {
180fe6e33a3SDouglas Gregor typedef typename tuple_element<I-1, tuple<Values...> >::type Element;
181fe6e33a3SDouglas Gregor typedef typename add_reference<Element>::type RJ;
182fe6e33a3SDouglas Gregor typedef typename add_const_reference<Element>::type PJ;
183fe6e33a3SDouglas Gregor typedef get_impl<I-1, tuple<Values...> > Next;
184fe6e33a3SDouglas Gregor public:
get(tuple<Head,Values...> & t)185fe6e33a3SDouglas Gregor static RJ get(tuple<Head, Values...>& t) { return Next::get(t.tail()); }
get(const tuple<Head,Values...> & t)186fe6e33a3SDouglas Gregor static PJ get(const tuple<Head, Values...>& t) { return Next::get(t.tail()); }
187fe6e33a3SDouglas Gregor };
188fe6e33a3SDouglas Gregor
189fe6e33a3SDouglas Gregor template<typename Head, typename... Values>
190fe6e33a3SDouglas Gregor class get_impl<0, tuple<Head, Values...> > {
191fe6e33a3SDouglas Gregor typedef typename add_reference<Head>::type RJ;
192fe6e33a3SDouglas Gregor typedef typename add_const_reference<Head>::type PJ;
193fe6e33a3SDouglas Gregor public:
get(tuple<Head,Values...> & t)194fe6e33a3SDouglas Gregor static RJ get(tuple<Head, Values...>& t) { return t.head(); }
get(const tuple<Head,Values...> & t)195fe6e33a3SDouglas Gregor static PJ get(const tuple<Head, Values...>& t) { return t.head(); }
196fe6e33a3SDouglas Gregor };
197fe6e33a3SDouglas Gregor
198fe6e33a3SDouglas Gregor template<int I, typename... Values> typename add_reference<
199fe6e33a3SDouglas Gregor typename tuple_element<I, tuple<Values...> >::type >::type
get(tuple<Values...> & t)200fe6e33a3SDouglas Gregor get(tuple<Values...>& t) {
201fe6e33a3SDouglas Gregor return get_impl<I, tuple<Values...> >::get(t);
202fe6e33a3SDouglas Gregor }
203fe6e33a3SDouglas Gregor
204fe6e33a3SDouglas Gregor template<int I, typename... Values> typename add_const_reference<
205fe6e33a3SDouglas Gregor typename tuple_element<I, tuple<Values...> >::type >::type
get(const tuple<Values...> & t)206fe6e33a3SDouglas Gregor get(const tuple<Values...>& t) {
207fe6e33a3SDouglas Gregor return get_impl<I, tuple<Values...> >::get(t);
208fe6e33a3SDouglas Gregor }
209fe6e33a3SDouglas Gregor
test_element_access(tuple<int *,float *,double * &> t3)210fe6e33a3SDouglas Gregor void test_element_access(tuple<int*, float*, double*&> t3) {
211fe6e33a3SDouglas Gregor int i;
212fe6e33a3SDouglas Gregor float f;
213fe6e33a3SDouglas Gregor double d;
214fe6e33a3SDouglas Gregor get<0>(t3) = &i;
215fe6e33a3SDouglas Gregor get<1>(t3) = &f;
216fe6e33a3SDouglas Gregor get<2>(t3) = &d;
217fe6e33a3SDouglas Gregor }
218fe6e33a3SDouglas Gregor
219fe6e33a3SDouglas Gregor // Relational operators
operator ==(const tuple<> &,const tuple<> &)220fe6e33a3SDouglas Gregor inline bool operator==(const tuple<>&, const tuple<>&) { return true; }
221fe6e33a3SDouglas Gregor
222fe6e33a3SDouglas Gregor template<typename T, typename... TTail, typename U, typename... UTail>
operator ==(const tuple<T,TTail...> & t,const tuple<U,UTail...> & u)223fe6e33a3SDouglas Gregor bool operator==(const tuple<T, TTail...>& t, const tuple<U, UTail...>& u) {
224fe6e33a3SDouglas Gregor return t.head() == u.head() && t.tail() == u.tail();
225fe6e33a3SDouglas Gregor }
226fe6e33a3SDouglas Gregor
227fe6e33a3SDouglas Gregor template<typename... TValues, typename... UValues>
operator !=(const tuple<TValues...> & t,const tuple<UValues...> & u)228fe6e33a3SDouglas Gregor bool operator!=(const tuple<TValues...>& t, const tuple<UValues...>& u) {
229fe6e33a3SDouglas Gregor return !(t == u);
230fe6e33a3SDouglas Gregor }
231fe6e33a3SDouglas Gregor
operator <(const tuple<> &,const tuple<> &)232fe6e33a3SDouglas Gregor inline bool operator<(const tuple<>&, const tuple<>&) { return false; }
233fe6e33a3SDouglas Gregor
234fe6e33a3SDouglas Gregor template<typename T, typename... TTail, typename U, typename... UTail>
operator <(const tuple<T,TTail...> & t,const tuple<U,UTail...> & u)235fe6e33a3SDouglas Gregor bool operator<(const tuple<T, TTail...>& t, const tuple<U, UTail...>& u) {
236fe6e33a3SDouglas Gregor return (t.head() < u.head() || (!(t.head() < u.head()) && t.tail() < u.tail()));
237fe6e33a3SDouglas Gregor }
238fe6e33a3SDouglas Gregor
239fe6e33a3SDouglas Gregor template<typename... TValues, typename... UValues>
operator >(const tuple<TValues...> & t,const tuple<UValues...> & u)240fe6e33a3SDouglas Gregor bool operator>(const tuple<TValues...>& t, const tuple<UValues...>& u) {
241fe6e33a3SDouglas Gregor return u < t;
242fe6e33a3SDouglas Gregor }
243fe6e33a3SDouglas Gregor
244fe6e33a3SDouglas Gregor template<typename... TValues, typename... UValues>
operator <=(const tuple<TValues...> & t,const tuple<UValues...> & u)245fe6e33a3SDouglas Gregor bool operator<=(const tuple<TValues...>& t, const tuple<UValues...>& u) {
246fe6e33a3SDouglas Gregor return !(u < t);
247fe6e33a3SDouglas Gregor }
248fe6e33a3SDouglas Gregor
249fe6e33a3SDouglas Gregor template<typename... TValues, typename... UValues>
operator >=(const tuple<TValues...> & t,const tuple<UValues...> & u)250fe6e33a3SDouglas Gregor bool operator>=(const tuple<TValues...>& t, const tuple<UValues...>& u) {
251fe6e33a3SDouglas Gregor return !(t < u);
252fe6e33a3SDouglas Gregor }
253fe6e33a3SDouglas Gregor
test_relational_operators(tuple<int *,float *,double * > t3)254fe6e33a3SDouglas Gregor void test_relational_operators(tuple<int*, float*, double*> t3) {
255fe6e33a3SDouglas Gregor (void)(t3 == t3);
256fe6e33a3SDouglas Gregor (void)(t3 != t3);
257fe6e33a3SDouglas Gregor (void)(t3 < t3);
258fe6e33a3SDouglas Gregor (void)(t3 <= t3);
259fe6e33a3SDouglas Gregor (void)(t3 >= t3);
260fe6e33a3SDouglas Gregor (void)(t3 > t3);
261fe6e33a3SDouglas Gregor };
262