1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++98, c++03, c++11, c++14
// <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(int, char**) {
{
using V = std::variant<int, long>;
constexpr V v;
static_assert(!v.valueless_by_exception(), "");
}
{
using V = std::variant<int, long>;
V v;
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
return 0;
}
|
