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