operator<<()

template<class T >

std::ostream& operator<<	(	std::ostream &	os,
		const aff::ConstArray< T > &	a
	)

print values of an NxM array

This operator function can be used as an output operator for aff::Array and aff:ConstArray objects. It silently assumes that the passed array has only two dimensions. It then uses formatted stream output to display the contents of the array.

The function in particular demonstrates the use of array member functions size, first, and last in order to query the index value ranges for the two dimensions in use.

Definition at line 104 of file arrayexample.cc.

{
  // size of array dimensions
  int N=a.size(0);
  int M=a.size(1);

  // report size of array
  cout << "Elements (i,j) of " << N << "x" << M << " array:" << endl;

  // width of first column, where value of i will be printed
  const int firstwidth=6;
  // width of columns:
  int columnwidth=(78-firstwidth)/M;

  // print column headings
  cout.width(firstwidth);
  cout.setf(std::ios_base::left, std::ios_base::adjustfield);
  cout << "";
  for (int j=a.first(1); j<=a.last(1); j++)
  {
    cout << "j=";
    cout.width(columnwidth-2);
    cout.setf(std::ios_base::left, std::ios_base::adjustfield);
    cout << j;
  }
  cout << endl;

  // print contents of array
  // outer loop: first index
  for (int i=a.first(0); i<=a.last(0); i++)
  {
    cout << "i=";
    cout.width(firstwidth-2);
    cout.setf(std::ios_base::left, std::ios_base::adjustfield);
    cout << i;
    // inner loop: second index
    for (int j=a.first(1); j<=a.last(1); j++)
    {
      cout.width(columnwidth);
      cout << a(i,j);
    }
    cout << endl;
  }
  return os;
} // std::ostream& operator<<(std::ostream& os, const aff::ConstArray<T>& a)