21 lines · cpp
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++14, c++17, c++2010 11// template<class E> unexpected(E) -> unexpected<E>;12 13#include <concepts>14#include <expected>15 16struct Foo{};17 18static_assert(std::same_as<decltype(std::unexpected(5)), std::unexpected<int>>);19static_assert(std::same_as<decltype(std::unexpected(Foo{})), std::unexpected<Foo>>);20static_assert(std::same_as<decltype(std::unexpected(std::unexpected<int>(5))), std::unexpected<int>>);21