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///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2016 Edouard Griffiths, F4EXB. //
// //
// 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 as version 3 of the License, or //
// //
// 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 V3 for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
///////////////////////////////////////////////////////////////////////////////////
#ifndef DOUBLEBUFFER_H_
#define DOUBLEBUFFER_H_
#include <string.h>
#include <assert.h>
namespace DSDcc
{
template<typename T>
class DoubleBuffer
{
public:
explicit DoubleBuffer(unsigned int size) :
m_size(size),
m_index(0)
{
assert(m_size > 0);
m_buffer = new T[2*m_size];
reset();
}
DoubleBuffer(const DoubleBuffer& other) :
m_size(other.m_size),
m_index(other.m_index)
{
m_buffer = new T[2*m_size];
memcpy(m_buffer, other.m_buffer, 2*m_size*sizeof(T));
reset();
}
DoubleBuffer& operator=(const DoubleBuffer& other)
{
if (&other == this) {
return *this;
}
m_size = other.m_size;
m_index = other.m_index;
m_buffer = new T[2*m_size];
memcpy(m_buffer, other.m_buffer, 2*m_size*sizeof(T));
reset();
return *this;
}
~DoubleBuffer()
{
delete[] m_buffer;
}
void resize(unsigned int size)
{
delete[] m_buffer;
m_size = size;
m_buffer = new T[2*m_size];
reset();
}
void push(T item)
{
m_buffer[m_index] = item;
m_buffer[m_index + m_size] = item;
m_index = (m_index + 1) % m_size;
}
void reset()
{
m_index = 0;
memset(m_buffer, 0, 2*m_size*sizeof(T));
}
void move(int distance)
{
m_index = (m_index + m_size + distance) % m_size;
}
T *getData(unsigned int shift = 0) // point to oldest by default
{
if (shift < m_size)
{
return &m_buffer[m_index+shift];
}
else
{
return &m_buffer[m_index]; // oldest
}
}
T& getLatest()
{
return m_buffer[m_index + m_size - 1];
}
T* getBack(unsigned int shift = 0) // point to oldest by default
{
if (shift < m_size)
{
return &m_buffer[(m_index + m_size - shift) % m_size];
}
else
{
return &m_buffer[m_index]; // oldest
}
}
private:
unsigned int m_size;
int m_index;
T *m_buffer;
};
} // namespace DSDcc
#endif /* DOUBLEBUFFER_H_ */
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