This repository has been archived on 2020-05-25. You can view files and clone it, but cannot push or open issues or pull requests.
tdlib-fork/tdutils/td/utils/optional.h

43 lines
929 B
C
Raw Normal View History

//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#pragma once
#include "td/utils/Status.h"
#include <type_traits>
#include <utility>
namespace td {
template <class T>
class optional {
public:
optional() = default;
template <class T1,
std::enable_if_t<!std::is_same<std::decay_t<T1>, optional>::value && std::is_constructible<T, T1>::value,
int> = 0>
optional(T1 &&t) : impl_(std::forward<T1>(t)) {
}
explicit operator bool() const {
return impl_.is_ok();
}
T &value() {
return impl_.ok_ref();
}
const T &value() const {
return impl_.ok_ref();
}
T &operator*() {
return value();
}
private:
Result<T> impl_;
};
} // namespace td