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62 lines
1.3 KiB
C++
62 lines
1.3 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++98, c++03, c++11, c++14
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// <variant>
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// template <class ...Types> class variant;
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// constexpr size_t index() const noexcept;
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#include <cassert>
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#include <string>
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#include <type_traits>
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#include <variant>
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#include "archetypes.hpp"
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#include "test_macros.h"
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#include "variant_test_helpers.hpp"
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int main() {
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{
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using V = std::variant<int, long>;
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constexpr V v;
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static_assert(v.index() == 0, "");
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}
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{
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using V = std::variant<int, long>;
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V v;
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assert(v.index() == 0);
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}
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{
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using V = std::variant<int, long>;
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constexpr V v(std::in_place_index<1>);
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static_assert(v.index() == 1, "");
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}
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{
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using V = std::variant<int, std::string>;
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V v("abc");
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assert(v.index() == 1);
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v = 42;
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assert(v.index() == 0);
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}
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#ifndef TEST_HAS_NO_EXCEPTIONS
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{
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using V = std::variant<int, MakeEmptyT>;
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V v;
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assert(v.index() == 0);
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makeEmpty(v);
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assert(v.index() == std::variant_npos);
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}
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#endif
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}
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