1 // -*- C++ -*- 2 //===----------------------------------------------------------------------===// 3 // 4 // The LLVM Compiler Infrastructure 5 // 6 // This file is dual licensed under the MIT and the University of Illinois Open 7 // Source Licenses. See LICENSE.TXT for details. 8 // 9 //===----------------------------------------------------------------------===// 10 11 // UNSUPPORTED: c++98, c++03, c++11, c++14 12 13 // The following compilers don't consider a type an aggregate type (and 14 // consequently not a literal type) if it has a base class at all. 15 // In C++17, an aggregate type is allowed to have a base class if it's not 16 // virtual, private, nor protected (e.g. ConstexprTestTypes:::NoCtors). 17 // XFAIL: gcc-5, gcc-6 18 // XFAIL: clang-3.5, clang-3.6, clang-3.7, clang-3.8 19 // XFAIL: apple-clang-6, apple-clang-7, apple-clang-8.0 20 21 // <variant> 22 23 // template <class ...Types> class variant; 24 25 // constexpr size_t index() const noexcept; 26 27 #include <cassert> 28 #include <string> 29 #include <type_traits> 30 #include <variant> 31 32 #include "archetypes.hpp" 33 #include "test_macros.h" 34 #include "variant_test_helpers.hpp" 35 36 int main() { 37 #if TEST_STD_VER == 17 38 { // This test does not pass on C++20 or later; see https://bugs.llvm.org/show_bug.cgi?id=39232 39 using V = std::variant<int, ConstexprTestTypes::NoCtors>; 40 constexpr V v; 41 static_assert(v.index() == 0, ""); 42 } 43 #endif 44 { 45 using V = std::variant<int, long>; 46 constexpr V v(std::in_place_index<1>); 47 static_assert(v.index() == 1, ""); 48 } 49 { 50 using V = std::variant<int, std::string>; 51 V v("abc"); 52 assert(v.index() == 1); 53 v = 42; 54 assert(v.index() == 0); 55 } 56 #ifndef TEST_HAS_NO_EXCEPTIONS 57 { 58 using V = std::variant<int, MakeEmptyT>; 59 V v; 60 assert(v.index() == 0); 61 makeEmpty(v); 62 assert(v.index() == std::variant_npos); 63 } 64 #endif 65 } 66