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//===----------------------------------------------------------------------===//
//
// 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
// <optional>
// template<class T>
// optional(T) -> optional<T>;
#include <optional>
#include <cassert>
struct A {};
int main(int, char**)
{
// Test the explicit deduction guides
// Test the implicit deduction guides
{
// optional()
std::optional opt; // expected-error-re {{no viable constructor or deduction guide for deduction of template arguments of '{{(std::)?}}optional'}}
}
{
// optional(nullopt_t)
std::optional opt(std::nullopt); // expected-error-re@optional:* {{static assertion failed{{.*}}instantiation of optional with nullopt_t is ill-formed}}
}
return 0;
}
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