mirror of
https://github.com/dwhinham/mt32-pi.git
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7d30442bd5
Deprecate the [fluidsynth.soundfont.x] sections in mt32-pi.cfg and search for a .cfg file matching the SoundFont file name instead.
107 lines
2.3 KiB
C++
107 lines
2.3 KiB
C++
//
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// optional.h
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//
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// mt32-pi - A baremetal MIDI synthesizer for Raspberry Pi
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// Copyright (C) 2020-2022 Dale Whinham <daleyo@gmail.com>
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//
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// This file is part of mt32-pi.
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//
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// mt32-pi is free software: you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the Free Software
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// Foundation, either version 3 of the License, or (at your option) any later
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// version.
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//
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// mt32-pi is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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// FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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// details.
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//
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// You should have received a copy of the GNU General Public License along with
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// mt32-pi. If not, see <http://www.gnu.org/licenses/>.
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//
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#ifndef _optional_h
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#define _optional_h
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#include <assert.h>
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#include <circle/new.h>
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#include <circle/types.h>
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template<typename T>
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class TOptional
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{
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public:
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TOptional()
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: m_bSet(false)
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{
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}
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TOptional(const TOptional<T>& Other)
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{
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operator=(Other);
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}
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explicit TOptional(T&& Value)
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{
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m_bSet = true;
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new(reinterpret_cast<T*>(m_Value)) T(static_cast<T&&>(Value));
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}
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explicit TOptional(TOptional<T>&& Other)
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{
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m_bSet = Other.m_bSet;
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new(reinterpret_cast<T*>(m_Value)) T(*reinterpret_cast<const T*>(Other.m_Value));
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}
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~TOptional() { Reset(); }
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void Reset()
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{
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if (m_bSet)
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{
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m_bSet = false;
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reinterpret_cast<T*>(m_Value)->T::~T();
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}
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}
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constexpr const T& Value() const
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{
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assert(m_bSet);
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return *reinterpret_cast<const T*>(m_Value);
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}
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constexpr const T& ValueOr(const T& OtherValue) const
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{
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return m_bSet ? Value() : OtherValue;
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}
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constexpr explicit operator bool() const
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{
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return m_bSet;
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}
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TOptional<T>& operator =(const TOptional<T>& Other)
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{
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m_bSet = Other.m_bSet;
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*reinterpret_cast<T*>(m_Value) = *reinterpret_cast<const T*>(Other.m_Value);
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return *this;
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}
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TOptional<T>& operator =(const T& Value)
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{
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m_bSet = true;
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*reinterpret_cast<T*>(m_Value) = Value;
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return *this;
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}
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constexpr const T& operator *() const { return Value(); }
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constexpr const T* operator ->() const { return &Value(); }
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constexpr const T* operator &() const { return &Value(); }
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private:
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bool m_bSet;
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alignas(T) u8 m_Value[sizeof(T)];
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};
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#endif
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