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 // <variant> 14 15 // template <class ...Types> class variant; 16 17 // constexpr size_t index() const noexcept; 18 19 #include <cassert> 20 #include <string> 21 #include <type_traits> 22 #include <variant> 23 24 #include "archetypes.hpp" 25 #include "test_macros.h" 26 #include "variant_test_helpers.hpp" 27 28 int main() { 29 { 30 using V = std::variant<int, ConstexprTestTypes::NoCtors>; 31 constexpr V v; 32 static_assert(v.index() == 0, ""); 33 } 34 { 35 using V = std::variant<int, long>; 36 constexpr V v(std::in_place_index<1>); 37 static_assert(v.index() == 1, ""); 38 } 39 { 40 using V = std::variant<int, std::string>; 41 V v("abc"); 42 assert(v.index() == 1); 43 v = 42; 44 assert(v.index() == 0); 45 } 46 #ifndef TEST_HAS_NO_EXCEPTIONS 47 { 48 using V = std::variant<int, MakeEmptyT>; 49 V v; 50 assert(v.index() == 0); 51 makeEmpty(v); 52 assert(v.index() == std::variant_npos); 53 } 54 #endif 55 } 56