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1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9// UNSUPPORTED: c++03, c++11, c++1410 11// <variant>12 13// template <size_t I, class... Types>14//  constexpr add_pointer_t<variant_alternative_t<I, variant<Types...>>>15//   get_if(variant<Types...>* v) noexcept;16// template <size_t I, class... Types>17//  constexpr add_pointer_t<const variant_alternative_t<I, variant<Types...>>>18//   get_if(const variant<Types...>* v) noexcept;19 20#include "test_macros.h"21#include "variant_test_helpers.h"22#include <cassert>23#include <memory>24#include <variant>25 26void test_const_get_if() {27  {28    using V = std::variant<int>;29    constexpr const V *v = nullptr;30    static_assert(std::get_if<0>(v) == nullptr, "");31  }32  {33    using V = std::variant<int, const long>;34    constexpr V v(42);35    ASSERT_NOEXCEPT(std::get_if<0>(&v));36    ASSERT_SAME_TYPE(decltype(std::get_if<0>(&v)), const int *);37    static_assert(*std::get_if<0>(&v) == 42, "");38    static_assert(std::get_if<1>(&v) == nullptr, "");39  }40  {41    using V = std::variant<int, const long>;42    constexpr V v(42l);43    ASSERT_SAME_TYPE(decltype(std::get_if<1>(&v)), const long *);44    static_assert(*std::get_if<1>(&v) == 42, "");45    static_assert(std::get_if<0>(&v) == nullptr, "");46  }47}48 49void test_get_if() {50  {51    using V = std::variant<int>;52    V *v = nullptr;53    assert(std::get_if<0>(v) == nullptr);54  }55  {56    using V = std::variant<int, long>;57    V v(42);58    ASSERT_NOEXCEPT(std::get_if<0>(&v));59    ASSERT_SAME_TYPE(decltype(std::get_if<0>(&v)), int *);60    assert(*std::get_if<0>(&v) == 42);61    assert(std::get_if<1>(&v) == nullptr);62  }63  {64    using V = std::variant<int, const long>;65    V v(42l);66    ASSERT_SAME_TYPE(decltype(std::get_if<1>(&v)), const long *);67    assert(*std::get_if<1>(&v) == 42);68    assert(std::get_if<0>(&v) == nullptr);69  }70}71 72int main(int, char**) {73  test_const_get_if();74  test_get_if();75 76  return 0;77}78