reservable_array_impl.h

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/*
 * Copyright (c) 2011-2015:  G-CSC, Goethe University Frankfurt
 * Author: Martin Rupp
 * 
 * This file is part of UG4.
 * 
 * UG4 is free software: you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License version 3 (as published by the
 * Free Software Foundation) with the following additional attribution
 * requirements (according to LGPL/GPL v3 §7):
 * 
 * (1) The following notice must be displayed in the Appropriate Legal Notices
 * of covered and combined works: "Based on UG4 (www.ug4.org/license)".
 * 
 * (2) The following notice must be displayed at a prominent place in the
 * terminal output of covered works: "Based on UG4 (www.ug4.org/license)".
 * 
 * (3) The following bibliography is recommended for citation and must be
 * preserved in all covered files:
 * "Reiter, S., Vogel, A., Heppner, I., Rupp, M., and Wittum, G. A massively
 *   parallel geometric multigrid solver on hierarchically distributed grids.
 *   Computing and visualization in science 16, 4 (2013), 151-164"
 * "Vogel, A., Reiter, S., Rupp, M., Nägel, A., and Wittum, G. UG4 -- a novel
 *   flexible software system for simulating pde based models on high performance
 *   computers. Computing and visualization in science 16, 4 (2013), 165-179"
 * 
 * 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 Lesser General Public License for more details.
 */
 
 
#ifndef __H__UG__COMMON__VARIABLE_ARRAY_IMPL_H__
#define __H__UG__COMMON__VARIABLE_ARRAY_IMPL_H__
 
#include "storage.h"
#include "variable_array.h"
#include <algorithm> // for min
#include <cstring>
 
namespace ug{
 
 
 
 
template<typename T, eMatrixOrdering T_ordering>
ReservableArray2<T, T_ordering>::ReservableArray2()
{
  values = NULL;
  rows = 0;
  cols = 0;
  arraySize = 0;
}
 
 
template<typename T, eMatrixOrdering T_ordering>
ReservableArray2<T, T_ordering>::ReservableArray2(size_t rows, size_t cols)
{
  values = NULL;
  rows = 0;
  cols = 0;
  arraySize = 0;
  resize(rows, cols);
}
 
template<typename T, eMatrixOrdering T_ordering>
ReservableArray2<T, T_ordering>::ReservableArray2(const ReservableArray2<T, T_ordering> &other)
{
  if(this == &other) return;
  if(values) { delete[] values; values = NULL; }
  rows = 0;
  cols = 0;
  arraySize = 0;
  resize(other.num_rows(), other.num_cols());
  for(size_type i=0; i<rows*cols; i++)
    values[i] = other.values[i];
}
 
template<typename T, eMatrixOrdering T_ordering>
ReservableArray2<T, T_ordering>::~ReservableArray2()
{
  if(values) { delete[] values; values = NULL; }
  rows = cols = 0;
}
 
// Capacity
 
template<typename T, eMatrixOrdering T_ordering>
size_t
ReservableArray2<T, T_ordering>::num_rows() const
{
  return rows;
}
 
template<typename T, eMatrixOrdering T_ordering>
size_t
ReservableArray2<T, T_ordering>::num_cols() const
{
  return cols;
}
 
 
template<typename T, eMatrixOrdering T_ordering>
bool
ReservableArray2<T, T_ordering>::resize(size_t newRows, size_t newCols, bool bCopyValues)
{
  assert(newRows >= 0 && newCols >= 0);
  if(newRows == rows && newCols == cols) return true;
 
  if(newRows == 0 && newCols == 0)
  {
    rows = cols = 0;
    if(values) delete[] values;
    values = NULL;
    return true;
  }
 
  if(bCopyValues)
  {
    size_t minRows = std::min(rows, newRows);
    size_t minCols = std::min(cols, newCols);
    if(newRows*newCols > arraySize)
    {
      value_type *new_values = new T[newRows*newCols];
      arraySize = newRows*newCols;
      memset(new_values, 0, sizeof(T)*newRows*newCols); // todo: think about that
      UG_ASSERT(new_values != NULL, "out of memory");
      if(new_values==NULL) return false;
      /*
      if(storage_traits<value_type>::is_static)
      {
        ...
      }
      else {
 
       */
 
      // we are using swap to avoid re-allocations
      if(T_ordering==RowMajor)
        for(size_t r=0; r<minRows; r++)
          for(size_t c=0; c<minCols; c++)
            std::swap(new_values[c+r*newCols], values[c+r*cols]);
      else
        for(size_t r=0; r<minRows; r++)
          for(size_t c=0; c<minCols; c++)
            std::swap(new_values[r+c*newRows], values[r+c*rows]);
 
      if(values) delete[] values;
    }
    else
    {
      if(T_ordering==RowMajor)
      {
        if(newCols < cols)
        {
          for(size_t r=1; r<minRows; r++)
            for(size_t c=0; c<minCols; c++)
              std::swap(values[c+r*newCols], values[c+r*cols]);
 
        }
        else if(newCols > cols)
        {
          for(size_t r=minRows-1; r>0; r--)
          {
            size_t c=newCols-1;
            do
              std::swap(values[c+r*newCols], values[c+r*cols]);
            while(--c > 0);
          }
        }
        else
        {
          // nothing to do
        }
      }
      else
      {
        if(newRows < rows)
        {
          for(size_t c=1; c<minCols; c++)
            for(size_t r=0; r<minRows; r++)
              std::swap(values[r+c*newRows], values[r+c*rows]);
 
        }
        else if(newRows > rows)
        {
          for(size_t c=minCols-1; c>0; c--)
          {
            size_t r=newRows-1;
            do
              std::swap(values[r+c*newRows], values[r+c*rows]);
            while(--r > 0);
          }
        }
        else
        {
          // nothing to do
        }
      }
 
    }
  }
  rows = newRows;
  cols = newCols;
  values = new_values;
  return true;
}
 
 
template<typename T, eMatrixOrdering T_ordering>
T &
ReservableArray2<T, T_ordering>::operator()(size_t r, size_t c)
{
  assert(r>=0 && r<rows);
  assert(c>=0 && c<cols);
  if(T_ordering==RowMajor)
    return values[c+r*cols];
  else
    return values[r+c*rows];
}
 
template<typename T, eMatrixOrdering T_ordering>
const T &
ReservableArray2<T, T_ordering>::operator()(size_t r, size_t c) const
{
  assert(r>=0 && r<rows);
  assert(c>=0 && c<cols);
  if(T_ordering==RowMajor)
    return values[c+r*cols];
  else
    return values[r+c*rows];
}
 
template<typename T, eMatrixOrdering T_ordering>
std::ostream &operator << (std::ostream &out, const ReservableArray2<T, T_ordering> &arr)
{
  out << "[ ";
  //out << "ReservableArray2 (" << arr.num_rows() << "x" << arr.num_cols() << "), " << ((T_ordering == ColMajor) ? "ColMajor" : "RowMajor") << endl;
  typedef size_t size_type;
  for(size_type r=0; r<arr.num_rows(); r++)
  {
    for(size_type c=0; c<arr.num_cols(); c++)
      out << arr(r, c) << " ";
    if(r != arr.num_rows()-1) out << "| ";
  }
  out << "]";
  return out;
}
 
}
#endif // __H__UG__COMMON__VARIABLE_ARRAY_IMPL_H__