// -*- coding: utf-8 -*-
// Time-stamp: <array2dd.hpp   4 nov 2016 08:45:51>

// Implementation of 2d m×n arrays with single array of size m×n

#ifndef ARRAY2DD_H
#define ARRAY2DD_H

class Array2dd {
public:
  // Constructors
  // Default constructor with no allocation
  Array2dd() : nlin(0), ncol(0), p(nullptr) {};
  // Constructor from dimensions
  Array2dd(int m, int n);
  // Copy constructor
  Array2dd(const Array2dd& a);
  // Assignment operator
  Array2dd& operator=(const Array2dd& a);
  // Access operator to a non-constant array
  double& operator()(int i, int j);
  // Access operator to a constant array
  const double& operator()(int i, int j) const;
  // Destructor
  ~Array2dd() { free(); }
private:
  // Alloc the array
  // + nlin and ncol must be valid
  void alloc();
  // Free the array
  void free();  
  // Copy from another array
  // + nlin and ncol must be valid
  // + array must be allocated
  void copy(const double* t);
  int nlin;			// Number of lines
  int ncol;			// Number of columns
  // Unidimentional array containing all elements.
  // Element [i,j] is at position p[i*ncol+j]
  double* p;   
};
#endif