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// -*- 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++03, c++11, c++14
// <variant>
// template <size_t I, class... Types>
// constexpr add_pointer_t<variant_alternative_t<I, variant<Types...>>>
// get_if(variant<Types...>* v) noexcept;
// template <size_t I, class... Types>
// constexpr add_pointer_t<const variant_alternative_t<I, variant<Types...>>>
// get_if(const variant<Types...>* v) noexcept;
#include "test_macros.h"
#include "variant_test_helpers.h"
#include <cassert>
#include <memory>
#include <variant>
void test_const_get_if() {
{
using V = std::variant<int>;
constexpr const V *v = nullptr;
static_assert(std::get_if<0>(v) == nullptr, "");
}
{
using V = std::variant<int, const long>;
constexpr V v(42);
ASSERT_NOEXCEPT(std::get_if<0>(&v));
ASSERT_SAME_TYPE(decltype(std::get_if<0>(&v)), const int *);
static_assert(*std::get_if<0>(&v) == 42, "");
static_assert(std::get_if<1>(&v) == nullptr, "");
}
{
using V = std::variant<int, const long>;
constexpr V v(42l);
ASSERT_SAME_TYPE(decltype(std::get_if<1>(&v)), const long *);
static_assert(*std::get_if<1>(&v) == 42, "");
static_assert(std::get_if<0>(&v) == nullptr, "");
}
// FIXME: Remove these once reference support is reinstated
#if !defined(TEST_VARIANT_HAS_NO_REFERENCES)
{
using V = std::variant<int &>;
int x = 42;
const V v(x);
ASSERT_SAME_TYPE(decltype(std::get_if<0>(&v)), int *);
assert(std::get_if<0>(&v) == &x);
}
{
using V = std::variant<int &&>;
int x = 42;
const V v(std::move(x));
ASSERT_SAME_TYPE(decltype(std::get_if<0>(&v)), int *);
assert(std::get_if<0>(&v) == &x);
}
{
using V = std::variant<const int &&>;
int x = 42;
const V v(std::move(x));
ASSERT_SAME_TYPE(decltype(std::get_if<0>(&v)), const int *);
assert(std::get_if<0>(&v) == &x);
}
#endif
}
void test_get_if() {
{
using V = std::variant<int>;
V *v = nullptr;
assert(std::get_if<0>(v) == nullptr);
}
{
using V = std::variant<int, long>;
V v(42);
ASSERT_NOEXCEPT(std::get_if<0>(&v));
ASSERT_SAME_TYPE(decltype(std::get_if<0>(&v)), int *);
assert(*std::get_if<0>(&v) == 42);
assert(std::get_if<1>(&v) == nullptr);
}
{
using V = std::variant<int, const long>;
V v(42l);
ASSERT_SAME_TYPE(decltype(std::get_if<1>(&v)), const long *);
assert(*std::get_if<1>(&v) == 42);
assert(std::get_if<0>(&v) == nullptr);
}
// FIXME: Remove these once reference support is reinstated
#if !defined(TEST_VARIANT_HAS_NO_REFERENCES)
{
using V = std::variant<int &>;
int x = 42;
V v(x);
ASSERT_SAME_TYPE(decltype(std::get_if<0>(&v)), int *);
assert(std::get_if<0>(&v) == &x);
}
{
using V = std::variant<const int &>;
int x = 42;
V v(x);
ASSERT_SAME_TYPE(decltype(std::get_if<0>(&v)), const int *);
assert(std::get_if<0>(&v) == &x);
}
{
using V = std::variant<int &&>;
int x = 42;
V v(std::move(x));
ASSERT_SAME_TYPE(decltype(std::get_if<0>(&v)), int *);
assert(std::get_if<0>(&v) == &x);
}
{
using V = std::variant<const int &&>;
int x = 42;
V v(std::move(x));
ASSERT_SAME_TYPE(decltype(std::get_if<0>(&v)), const int *);
assert(std::get_if<0>(&v) == &x);
}
#endif
}
int main(int, char**) {
test_const_get_if();
test_get_if();
return 0;
}
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