d4b59a05fc
Even if these comments have a benefit in .h files (for editors that care about language but can't be configured to treat .h as C++ code), they certainly have no benefit for files with the .cpp extension. Discussed in D110794.
62 lines
1.3 KiB
C++
62 lines
1.3 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: 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.h"
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#include "test_macros.h"
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#include "variant_test_helpers.h"
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int main(int, char**) {
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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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return 0;
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}
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