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8008cf5287
Summary: In PR39232, we noticed that some variant tests started failing in C++2a mode with recent Clangs, because the rules for literal types changed in C++2a. As a result, a temporary fix was checked in (enabling the test only in C++17). This commit is what I believe should be the long term fix: I removed the tests that checked constexpr default-constructibility with a weird type from the tests for index() and valueless_by_exception(), and instead I added tests for those using an obviously literal type in the test for the default constructor. Reviewers: EricWF, mclow.lists Subscribers: christof, jkorous, dexonsmith, arphaman, libcxx-commits, rsmith Differential Revision: https://reviews.llvm.org/D54767 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@347568 91177308-0d34-0410-b5e6-96231b3b80d8
55 lines
1.2 KiB
C++
55 lines
1.2 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 bool valueless_by_exception() 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.valueless_by_exception(), "");
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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.valueless_by_exception());
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}
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{
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using V = std::variant<int, long, std::string>;
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const V v("abc");
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assert(!v.valueless_by_exception());
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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.valueless_by_exception());
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makeEmpty(v);
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assert(v.valueless_by_exception());
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}
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#endif
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}
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