#pragma once
#include <iostream>
using namespace std;

class matrix
{
	private:
	
		double *a;
		int n, m;
class Row
	{
	private:
		matrix* _matrix;
		int row;
		int i, m, j;

	public:

		double operator[](const int col)
		{
			if( i<0 || i>=m ) throw "Ошибка";
	
			return _matrix->GetValue(row,col);
		}
		Row(matrix* _m,int row)
		{
			_matrix=_m;
			this->row=row;

		}
	 };
			
	
 	public:

matrix :: matrix (const matrix &_matrix)
{
	cout << "Конструктор копирования " << this << endl;
	n=_matrix.n;
	m=_matrix.m;
	a = _matrix.a ? new double[n*m] : NULL;
	if(_matrix.a) memcpy(a,_matrix.a,n*m*sizeof(double));
}
	

		matrix (int = 0,int = 0, double* = NULL);
		matrix (const matrix&);
		~ matrix ();

		bool umnojenie (const matrix& ) const;
		bool summa (const matrix& ) const;

	//	const double* operator[] (int i) const;
	    Row operator[](int i) const;
		
		matrix& operator = (const matrix&);
		matrix& operator +=(const matrix&);
		matrix& operator -=(const matrix&);
		matrix& operator *=(const matrix&);
		matrix& operator *=(const double);

		friend matrix operator * (const matrix&, const matrix&);
		friend matrix operator * (const matrix&, double);
		friend matrix operator * (double , const matrix&);
		friend matrix operator + (const matrix&, const matrix&);
		friend matrix operator - (const matrix&, const matrix&);

		int get_Row () const;
		int get_Col () const;
	
		friend ostream& operator << (ostream&, const matrix &);

		int GetValue(int row, int col) const;
};