1 //===----------------------------------------------------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9
10 // UNSUPPORTED: c++98, c++03, c++11
11
12 // <experimental/tuple>
13
14 // template <class F, class T> constexpr decltype(auto) apply(F &&, T &&)
15
16 // Testing ref qualified functions
17
18 #include <experimental/tuple>
19 #include <cassert>
20
21 struct func_obj
22 {
func_objfunc_obj23 constexpr func_obj() {}
24
operator ()func_obj25 constexpr int operator()() const & { return 1; }
operator ()func_obj26 constexpr int operator()() const && { return 2; }
operator ()func_obj27 constexpr int operator()() & { return 3; }
operator ()func_obj28 constexpr int operator()() && { return 4; }
29 };
30
31 namespace ex = std::experimental;
32
main()33 int main()
34 {
35 // TODO(ericwf): Re-enable constexpr support
36 /*
37 {
38 constexpr func_obj f;
39 constexpr std::tuple<> tp;
40
41 static_assert(1 == ex::apply(static_cast<func_obj const &>(f), tp), "");
42 static_assert(2 == ex::apply(static_cast<func_obj const &&>(f), tp), "");
43 }
44 */
45 {
46 func_obj f;
47 std::tuple<> tp;
48 assert(1 == ex::apply(static_cast<func_obj const &>(f), tp));
49 assert(2 == ex::apply(static_cast<func_obj const &&>(f), tp));
50 assert(3 == ex::apply(static_cast<func_obj &>(f), tp));
51 assert(4 == ex::apply(static_cast<func_obj &&>(f), tp));
52 }
53 }
54