1 // RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s
2 // expected-no-diagnostics
3
4 // Various tests related to partial ordering of variadic templates.
5 template<typename ...Types> struct tuple;
6
7 template<typename Tuple>
8 struct X1 {
9 static const unsigned value = 0;
10 };
11
12 template<typename Head, typename ...Tail>
13 struct X1<tuple<Head, Tail...> > {
14 static const unsigned value = 1;
15 };
16
17 template<typename Head, typename ...Tail>
18 struct X1<tuple<Head, Tail&...> > {
19 static const unsigned value = 2;
20 };
21
22 template<typename Head, typename ...Tail>
23 struct X1<tuple<Head&, Tail&...> > {
24 static const unsigned value = 3;
25 };
26
27 int check0[X1<tuple<>>::value == 0? 1 : -1];
28 int check1[X1<tuple<int>>::value == 2? 1 : -1];
29 int check2[X1<tuple<int, int>>::value == 1? 1 : -1];
30 int check3[X1<tuple<int, int&>>::value == 2? 1 : -1];
31 int check4[X1<tuple<int&, int&>>::value == 3? 1 : -1];
32
33 // Partial ordering of function templates.
34 template<typename T1, typename T2, typename ...Rest>
35 int &f0(T1, T2, Rest...);
36
37 template<typename T1, typename T2>
38 float &f0(T1, T2);
39
test_f0()40 void test_f0() {
41 int &ir1 = f0(1, 2.0, 'a');
42 float &fr1 = f0(1, 2.0);
43 }
44
45 template<typename T1, typename T2, typename ...Rest>
46 int &f1(T1, T2, Rest...);
47
48 template<typename T1, typename T2>
49 float &f1(T1, T2, ...);
50
test_f1()51 void test_f1() {
52 int &ir1 = f1(1, 2.0, 'a');
53 }
54
55 template<typename T1, typename T2, typename ...Rest>
56 int &f2(T1, T2, Rest...);
57
58 float &f2(...);
59
test_f2()60 void test_f2() {
61 int &ir1 = f2(1, 2.0, 'a');
62 }
63