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https://github.com/86Box/86Box.git
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87 lines
2.0 KiB
C++
87 lines
2.0 KiB
C++
/*
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* This file is part of libsidplayfp, a SID player engine.
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*
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* Copyright (C) 2011-2014 Leandro Nini
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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 of the License, or
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* (at your option) 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; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef ARRAY_H
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#define ARRAY_H
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifdef HAVE_CXX11
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# include <atomic>
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#endif
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/**
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* Counter.
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*/
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class counter
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{
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private:
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#ifndef HAVE_CXX11
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volatile unsigned int c;
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#else
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std::atomic<unsigned int> c;
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#endif
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public:
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counter() : c(1) {}
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void increase() { ++c; }
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unsigned int decrease() { return --c; }
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};
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/**
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* Reference counted pointer to matrix wrapper, for use with standard containers.
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*/
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template<typename T>
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class matrix
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{
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private:
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T* data;
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counter* count;
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const unsigned int x, y;
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public:
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matrix(unsigned int x, unsigned int y) :
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data(new T[x * y]),
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count(new counter()),
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x(x),
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y(y) {}
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matrix(const matrix& p) :
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data(p.data),
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count(p.count),
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x(p.x),
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y(p.y) { count->increase(); }
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~matrix() { if (count->decrease() == 0) { delete count; delete [] data; } }
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unsigned int length() const { return x * y; }
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T* operator[](unsigned int a) { return &data[a * y]; }
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T const* operator[](unsigned int a) const { return &data[a * y]; }
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};
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typedef matrix<short> matrix_t;
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#endif
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