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 { 23 constexpr func_obj() {} 24 25 constexpr int operator()() const & { return 1; } 26 constexpr int operator()() const && { return 2; } 27 constexpr int operator()() & { return 3; } 28 constexpr int operator()() && { return 4; } 29 }; 30 31 namespace ex = std::experimental; 32 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
