portapack-mayhem/firmware/common/optional.hpp
Kyle Reed faa4367295
Allow frequency override in Playlist, Folder fixes (#1194)
* Allow frequency to be changed per-entry

* Folder fixes, use TX freq

---------

Co-authored-by: kallanreed <kallanreed@noreply.github.com>
2023-06-26 19:44:01 +02:00

69 lines
2.0 KiB
C++

/*
* Copyright (C) 2016 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __OPTIONAL_H__
#define __OPTIONAL_H__
#include <utility>
template <typename T>
class Optional {
public:
constexpr Optional()
: value_{}, valid_{false} {}
constexpr Optional(const T& value)
: value_{value}, valid_{true} {}
constexpr Optional(T&& value)
: value_{std::move(value)}, valid_{true} {}
constexpr Optional& operator=(const T& value) {
value_ = value;
valid_ = true;
return *this;
}
constexpr Optional& operator=(T&& value) {
value_ = std::move(value);
valid_ = true;
return *this;
}
bool is_valid() const { return valid_; }
operator bool() const { return valid_; }
// TODO: Throw if not valid?
T& value() & { return value_; }
T& operator*() & { return value_; }
const T& value() const& { return value_; }
const T& operator*() const& { return value_; }
T&& value() && { return std::move(value_); }
T&& operator*() && { return std::move(value_); }
T* operator->() { return &value_; }
const T* operator->() const { return &value_; }
private:
T value_;
bool valid_;
};
#endif /*__OPTIONAL_H__*/