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/****************************************************************************
* Copyright (C) from 2009 to Present EPAM Systems.
*
* This file is part of Indigo toolkit.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
***************************************************************************/
//
// Gray code enumertator without loops
//
#include "base_cpp/gray_codes.h"
#include "base_c/bitarray.h"
using namespace indigo;
CP_DEF(GrayCodesEnumerator);
GrayCodesEnumerator::GrayCodesEnumerator(int length, bool needFullCode) : CP_INIT, TL_CP_GET(_indices), TL_CP_GET(_code)
{
_bitChangeIndex = START;
_needFullCode = needFullCode;
_indices.resize(length + 1);
for (int i = 0; i <= length; i++)
_indices[i] = i;
if (needFullCode)
{
_code.resize(bitGetSize(length));
_code.zerofill();
}
}
void GrayCodesEnumerator::next(void)
{
if (_indices.size() - 1 == 0)
{
_bitChangeIndex = END;
return;
}
_bitChangeIndex = _indices[0];
if (_bitChangeIndex == _indices.size() - 1)
_bitChangeIndex = END;
else
{
_indices[0] = 0;
_indices[_bitChangeIndex] = _indices[_bitChangeIndex + 1];
_indices[_bitChangeIndex + 1] = _bitChangeIndex + 1;
if (_needFullCode)
bitFlipBit(_code.ptr(), _bitChangeIndex);
}
}
bool GrayCodesEnumerator::isDone(void)
{
return _bitChangeIndex == END;
}
int GrayCodesEnumerator::getBitChangeIndex(void)
{
return _bitChangeIndex;
}
const byte* GrayCodesEnumerator::getCode(void)
{
return _code.ptr();
}
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