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// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++98, c++03, c++11, c++14
// The following compilers don't allow constexpr variables of non-literal type.
// XFAIL: gcc-5, gcc-6
// XFAIL: clang-3.5, clang-3.6, clang-3.7, clang-3.8
// XFAIL: apple-clang-6, apple-clang-7, apple-clang-8
// <variant>
// template <class ...Types> class variant;
// constexpr bool valueless_by_exception() const noexcept;
#include <cassert>
#include <string>
#include <type_traits>
#include <variant>
#include "archetypes.hpp"
#include "test_macros.h"
#include "variant_test_helpers.hpp"
int main() {
{
using V = std::variant<int, ConstexprTestTypes::NoCtors>;
constexpr V v;
static_assert(!v.valueless_by_exception(), "");
}
{
using V = std::variant<int, long, std::string>;
const V v("abc");
assert(!v.valueless_by_exception());
}
#ifndef TEST_HAS_NO_EXCEPTIONS
{
using V = std::variant<int, MakeEmptyT>;
V v;
assert(!v.valueless_by_exception());
makeEmpty(v);
assert(v.valueless_by_exception());
}
#endif
}
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