partial-ordering.cpp revision 9da95e6eefc4b0ca25e18bdab1b703f5c185deab 
1// RUN: %clang_cc1 -std=c++0x -fsyntax-only -verify %s
2
3// Various tests related to partial ordering of variadic templates.
4template<typename ...Types> struct tuple;
5
6template<typename Tuple>
7struct X1 {
8  static const unsigned value = 0;
9};
10
11template<typename Head, typename ...Tail>
12struct X1<tuple<Head, Tail...> > {
13  static const unsigned value = 1;
14};
15
16template<typename Head, typename ...Tail>
17struct X1<tuple<Head, Tail&...> > {
18  static const unsigned value = 2;
19};
20
21template<typename Head, typename ...Tail>
22struct X1<tuple<Head&, Tail&...> > {
23  static const unsigned value = 3;
24};
25
26int check0[X1<tuple<>>::value == 0? 1 : -1];
27int check1[X1<tuple<int>>::value == 2? 1 : -1];
28int check2[X1<tuple<int, int>>::value == 1? 1 : -1];
29int check3[X1<tuple<int, int&>>::value == 2? 1 : -1];
30int check4[X1<tuple<int&, int&>>::value == 3? 1 : -1];
31
32// Partial ordering of function templates.
33template<typename T1, typename T2, typename ...Rest>
34int &f0(T1, T2, Rest...);
35
36template<typename T1, typename T2>
37float &f0(T1, T2);
38
39void test_f0() {
40  int &ir1 = f0(1, 2.0, 'a');
41  float &fr1 = f0(1, 2.0);
42}
43
44template<typename T1, typename T2, typename ...Rest>
45int &f1(T1, T2, Rest...);
46
47template<typename T1, typename T2>
48float &f1(T1, T2, ...);
49
50void test_f1() {
51  int &ir1 = f1(1, 2.0, 'a');
52}
53
54template<typename T1, typename T2, typename ...Rest>
55int &f2(T1, T2, Rest...);
56
57float &f2(...);
58
59void test_f2() {
60  int &ir1 = f2(1, 2.0, 'a');
61}
62