sdrangel/sdrbase/util/limitedcounter.h

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2.7 KiB
C++

///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2018 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 SDRBASE_UTIL_LIMITEDCOUNTER_H_
#define SDRBASE_UTIL_LIMITEDCOUNTER_H_
#include <stdint.h>
template<typename StoreType, uint32_t Limit>
class LimitedCounter
{
public:
LimitedCounter() :
m_counter(0)
{}
LimitedCounter(StoreType value) :
m_counter(value < Limit ? value : Limit - 1)
{}
void operator=(const LimitedCounter& rhs) {
m_counter = rhs.m_counter;
}
LimitedCounter& operator++() {
m_counter++;
if (m_counter >= Limit) {
m_counter = 0;
}
return *this;
}
LimitedCounter operator++(int) {
LimitedCounter temp = *this ;
m_counter++;
if (m_counter >= Limit) {
m_counter = 0;
}
return temp;
}
LimitedCounter& operator+=(const uint32_t rhs) {
m_counter += rhs;
if (m_counter >= Limit) {
m_counter -= Limit;
}
return *this;
}
StoreType value() const { return m_counter; }
friend LimitedCounter operator-(const LimitedCounter lhs, const LimitedCounter& rhs)
{
LimitedCounter result;
if (lhs.m_counter < rhs.m_counter) {
result.m_counter = Limit - lhs.m_counter + rhs.m_counter + 1;
} else {
result.m_counter = lhs.m_counter - rhs.m_counter;
}
return result;
}
private:
StoreType m_counter;
};
#endif /* SDRBASE_UTIL_LIMITEDCOUNTER_H_ */