134 lines
3.6 KiB
C++
134 lines
3.6 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++03, c++11, c++14
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// <variant>
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// template <size_t I, class... Types>
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// constexpr add_pointer_t<variant_alternative_t<I, variant<Types...>>>
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// get_if(variant<Types...>* v) noexcept;
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// template <size_t I, class... Types>
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// constexpr add_pointer_t<const variant_alternative_t<I, variant<Types...>>>
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// get_if(const variant<Types...>* v) noexcept;
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#include "test_macros.h"
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#include "variant_test_helpers.h"
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#include <cassert>
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#include <memory>
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#include <variant>
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void test_const_get_if() {
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{
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using V = std::variant<int>;
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constexpr const V *v = nullptr;
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static_assert(std::get_if<0>(v) == nullptr, "");
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}
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{
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using V = std::variant<int, const long>;
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constexpr V v(42);
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ASSERT_NOEXCEPT(std::get_if<0>(&v));
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ASSERT_SAME_TYPE(decltype(std::get_if<0>(&v)), const int *);
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static_assert(*std::get_if<0>(&v) == 42, "");
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static_assert(std::get_if<1>(&v) == nullptr, "");
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}
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{
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using V = std::variant<int, const long>;
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constexpr V v(42l);
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ASSERT_SAME_TYPE(decltype(std::get_if<1>(&v)), const long *);
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static_assert(*std::get_if<1>(&v) == 42, "");
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static_assert(std::get_if<0>(&v) == nullptr, "");
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}
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// FIXME: Remove these once reference support is reinstated
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#if !defined(TEST_VARIANT_HAS_NO_REFERENCES)
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{
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using V = std::variant<int &>;
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int x = 42;
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const V v(x);
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ASSERT_SAME_TYPE(decltype(std::get_if<0>(&v)), int *);
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assert(std::get_if<0>(&v) == &x);
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}
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{
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using V = std::variant<int &&>;
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int x = 42;
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const V v(std::move(x));
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ASSERT_SAME_TYPE(decltype(std::get_if<0>(&v)), int *);
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assert(std::get_if<0>(&v) == &x);
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}
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{
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using V = std::variant<const int &&>;
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int x = 42;
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const V v(std::move(x));
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ASSERT_SAME_TYPE(decltype(std::get_if<0>(&v)), const int *);
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assert(std::get_if<0>(&v) == &x);
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}
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#endif
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}
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void test_get_if() {
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{
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using V = std::variant<int>;
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V *v = nullptr;
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assert(std::get_if<0>(v) == nullptr);
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}
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{
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using V = std::variant<int, long>;
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V v(42);
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ASSERT_NOEXCEPT(std::get_if<0>(&v));
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ASSERT_SAME_TYPE(decltype(std::get_if<0>(&v)), int *);
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assert(*std::get_if<0>(&v) == 42);
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assert(std::get_if<1>(&v) == nullptr);
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}
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{
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using V = std::variant<int, const long>;
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V v(42l);
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ASSERT_SAME_TYPE(decltype(std::get_if<1>(&v)), const long *);
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assert(*std::get_if<1>(&v) == 42);
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assert(std::get_if<0>(&v) == nullptr);
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}
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// FIXME: Remove these once reference support is reinstated
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#if !defined(TEST_VARIANT_HAS_NO_REFERENCES)
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{
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using V = std::variant<int &>;
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int x = 42;
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V v(x);
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ASSERT_SAME_TYPE(decltype(std::get_if<0>(&v)), int *);
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assert(std::get_if<0>(&v) == &x);
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}
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{
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using V = std::variant<const int &>;
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int x = 42;
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V v(x);
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ASSERT_SAME_TYPE(decltype(std::get_if<0>(&v)), const int *);
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assert(std::get_if<0>(&v) == &x);
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}
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{
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using V = std::variant<int &&>;
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int x = 42;
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V v(std::move(x));
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ASSERT_SAME_TYPE(decltype(std::get_if<0>(&v)), int *);
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assert(std::get_if<0>(&v) == &x);
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}
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{
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using V = std::variant<const int &&>;
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int x = 42;
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V v(std::move(x));
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ASSERT_SAME_TYPE(decltype(std::get_if<0>(&v)), const int *);
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assert(std::get_if<0>(&v) == &x);
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}
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#endif
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}
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int main(int, char**) {
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test_const_get_if();
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test_get_if();
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return 0;
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}
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