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
|
// -*- 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
// <variant>
// template <class T, class... Types>
// constexpr bool holds_alternative(const variant<Types...>& v) noexcept;
#include "test_macros.h"
#include <variant>
int main() {
{
using V = std::variant<int>;
constexpr V v;
static_assert(std::holds_alternative<int>(v), "");
}
{
using V = std::variant<int, long>;
constexpr V v;
static_assert(std::holds_alternative<int>(v), "");
static_assert(!std::holds_alternative<long>(v), "");
}
{ // noexcept test
using V = std::variant<int>;
const V v;
ASSERT_NOEXCEPT(std::holds_alternative<int>(v));
}
}
|
