TernaryGrayCode.cpp

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// MIT License
//
// Copyright (c) 2023 Ian Parberry
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
 
#include "TernaryGrayCode.h"
 
 
void CTernaryGrayCode::Initialize(){ 
  CBinaryGrayCode::Initialize(); //reset as for the binary version
  
  for(size_t i=0; i<=m_nWidth+2; i++) //reset the direction array too
    m_nDirection[i] = 0;
} //initialize
 
 
size_t CTernaryGrayCode::Next(){
  const size_t i = m_nStack[0]; 
  m_nStack[0] = 1;
 
  const size_t j = 2*i - m_nBit[2*i - m_nDirection[i]];
  m_nBit[j] ^= 1;
 
  if(m_nBit[2*i] == m_nBit[2*i - 1]){
    m_nDirection[i] ^= 1;
    m_nStack[i - 1] = m_nStack[i];
    m_nStack[i] = i + 1;
  } //if
 
  return j - 1;
} //Next