127 lines
2.9 KiB
C++
127 lines
2.9 KiB
C++
// -*- 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
|
|
|
|
// XFAIL: dylib-has-no-bad_variant_access && !libcpp-no-exceptions
|
|
|
|
// <variant>
|
|
|
|
// template <class ...Types> class variant;
|
|
|
|
// constexpr variant() noexcept(see below);
|
|
|
|
#include <cassert>
|
|
#include <type_traits>
|
|
#include <variant>
|
|
|
|
#include "test_macros.h"
|
|
#include "variant_test_helpers.hpp"
|
|
|
|
struct NonDefaultConstructible {
|
|
constexpr NonDefaultConstructible(int) {}
|
|
};
|
|
|
|
struct NotNoexcept {
|
|
NotNoexcept() noexcept(false) {}
|
|
};
|
|
|
|
#ifndef TEST_HAS_NO_EXCEPTIONS
|
|
struct DefaultCtorThrows {
|
|
DefaultCtorThrows() { throw 42; }
|
|
};
|
|
#endif
|
|
|
|
void test_default_ctor_sfinae() {
|
|
{
|
|
using V = std::variant<std::monostate, int>;
|
|
static_assert(std::is_default_constructible<V>::value, "");
|
|
}
|
|
{
|
|
using V = std::variant<NonDefaultConstructible, int>;
|
|
static_assert(!std::is_default_constructible<V>::value, "");
|
|
}
|
|
#if !defined(TEST_VARIANT_HAS_NO_REFERENCES)
|
|
{
|
|
using V = std::variant<int &, int>;
|
|
static_assert(!std::is_default_constructible<V>::value, "");
|
|
}
|
|
#endif
|
|
}
|
|
|
|
void test_default_ctor_noexcept() {
|
|
{
|
|
using V = std::variant<int>;
|
|
static_assert(std::is_nothrow_default_constructible<V>::value, "");
|
|
}
|
|
{
|
|
using V = std::variant<NotNoexcept>;
|
|
static_assert(!std::is_nothrow_default_constructible<V>::value, "");
|
|
}
|
|
}
|
|
|
|
void test_default_ctor_throws() {
|
|
#ifndef TEST_HAS_NO_EXCEPTIONS
|
|
using V = std::variant<DefaultCtorThrows, int>;
|
|
try {
|
|
V v;
|
|
assert(false);
|
|
} catch (const int &ex) {
|
|
assert(ex == 42);
|
|
} catch (...) {
|
|
assert(false);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
void test_default_ctor_basic() {
|
|
{
|
|
std::variant<int> v;
|
|
assert(v.index() == 0);
|
|
assert(std::get<0>(v) == 0);
|
|
}
|
|
{
|
|
std::variant<int, long> v;
|
|
assert(v.index() == 0);
|
|
assert(std::get<0>(v) == 0);
|
|
}
|
|
{
|
|
std::variant<int, NonDefaultConstructible> v;
|
|
assert(v.index() == 0);
|
|
assert(std::get<0>(v) == 0);
|
|
}
|
|
{
|
|
using V = std::variant<int, long>;
|
|
constexpr V v;
|
|
static_assert(v.index() == 0, "");
|
|
static_assert(std::get<0>(v) == 0, "");
|
|
}
|
|
{
|
|
using V = std::variant<int, long>;
|
|
constexpr V v;
|
|
static_assert(v.index() == 0, "");
|
|
static_assert(std::get<0>(v) == 0, "");
|
|
}
|
|
{
|
|
using V = std::variant<int, NonDefaultConstructible>;
|
|
constexpr V v;
|
|
static_assert(v.index() == 0, "");
|
|
static_assert(std::get<0>(v) == 0, "");
|
|
}
|
|
}
|
|
|
|
int main(int, char**) {
|
|
test_default_ctor_basic();
|
|
test_default_ctor_sfinae();
|
|
test_default_ctor_noexcept();
|
|
test_default_ctor_throws();
|
|
|
|
return 0;
|
|
}
|