1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 // UNSUPPORTED: c++03, c++11 10 11 // Make sure that we don't blow up the template instantiation recursion depth 12 // for tuples of size <= 512. 13 14 #include <tuple> 15 #include <cassert> 16 #include <utility> 17 18 #include "test_macros.h" 19 20 template <std::size_t... I> CreateTuple(std::index_sequence<I...>)21constexpr void CreateTuple(std::index_sequence<I...>) { 22 using LargeTuple = std::tuple<std::integral_constant<std::size_t, I>...>; 23 using TargetTuple = std::tuple<decltype(I)...>; 24 LargeTuple tuple(std::integral_constant<std::size_t, I>{}...); 25 assert(std::get<0>(tuple).value == 0); 26 assert(std::get<sizeof...(I)-1>(tuple).value == sizeof...(I)-1); 27 28 TargetTuple t1 = tuple; // converting copy constructor from & 29 TargetTuple t2 = static_cast<LargeTuple const&>(tuple); // converting copy constructor from const& 30 TargetTuple t3 = std::move(tuple); // converting rvalue constructor 31 TargetTuple t4 = static_cast<LargeTuple const&&>(tuple); // converting const rvalue constructor 32 TargetTuple t5; // default constructor 33 (void)t1; (void)t2; (void)t3; (void)t4; (void)t5; 34 35 #if TEST_STD_VER >= 20 36 t1 = tuple; // converting assignment from & 37 t1 = static_cast<LargeTuple const&>(tuple); // converting assignment from const& 38 t1 = std::move(tuple); // converting assignment from && 39 t1 = static_cast<LargeTuple const&&>(tuple); // converting assignment from const&& 40 swap(t1, t2); // swap 41 #endif 42 // t1 == tuple; // comparison does not work yet (we blow the constexpr stack) 43 } 44 test()45constexpr bool test() { 46 CreateTuple(std::make_index_sequence<512>{}); 47 return true; 48 } 49 main(int,char **)50int main(int, char**) { 51 test(); 52 static_assert(test(), ""); 53 return 0; 54 } 55