79 lines
1.9 KiB
C++
79 lines
1.9 KiB
C++
//===----------------------------------------------------------------------===//
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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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// <optional>
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// UNSUPPORTED: c++03, c++11, c++14
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// template<class T>
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// optional(T) -> optional<T>;
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#include <optional>
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#include <cassert>
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#include "test_macros.h"
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struct A {};
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int main(int, char**)
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{
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// Test the explicit deduction guides
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{
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// optional(T)
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std::optional opt(5);
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ASSERT_SAME_TYPE(decltype(opt), std::optional<int>);
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assert(static_cast<bool>(opt));
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assert(*opt == 5);
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}
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{
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// optional(T)
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std::optional opt(A{});
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ASSERT_SAME_TYPE(decltype(opt), std::optional<A>);
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assert(static_cast<bool>(opt));
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}
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{
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// optional(const T&);
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const int& source = 5;
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std::optional opt(source);
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ASSERT_SAME_TYPE(decltype(opt), std::optional<int>);
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assert(static_cast<bool>(opt));
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assert(*opt == 5);
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}
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{
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// optional(T*);
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const int* source = nullptr;
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std::optional opt(source);
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ASSERT_SAME_TYPE(decltype(opt), std::optional<const int*>);
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assert(static_cast<bool>(opt));
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assert(*opt == nullptr);
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}
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{
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// optional(T[]);
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int source[] = {1, 2, 3};
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std::optional opt(source);
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ASSERT_SAME_TYPE(decltype(opt), std::optional<int*>);
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assert(static_cast<bool>(opt));
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assert((*opt)[0] == 1);
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}
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// Test the implicit deduction guides
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{
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// optional(optional);
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std::optional<char> source('A');
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std::optional opt(source);
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ASSERT_SAME_TYPE(decltype(opt), std::optional<char>);
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assert(static_cast<bool>(opt) == static_cast<bool>(source));
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assert(*opt == *source);
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}
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return 0;
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}
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