📄 matrix1.cpp.html

📁 《Big C++ 》Third Edition电子书和代码全集-Part1
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<pre>  1  #include &lt;cassert&gt;
  2  #include &lt;iomanip&gt;
  3  
  4  #include "matrix1.h"
  5  
  6  Matrix::Matrix()
  7  {
  8     for (int i = 0; i &lt; ROWS; i++)
  9        for (int j = 0; j &lt; COLUMNS; j++)
 10  	 (*this)(i, j) = 0;
 11  }
 12     
 13  double&amp; Matrix::operator()(int i, int j)
 14  {
 15     assert(0 &lt;= i &amp;&amp; i &lt; ROWS &amp;&amp; 0 &lt;= j &amp;&amp; j &lt; COLUMNS);
 16     return elements[i * COLUMNS + j];
 17  }
 18  
 19  double Matrix::operator()(int i, int j) const
 20  {
 21     assert(0 &lt;= i &amp;&amp; i &lt; ROWS &amp;&amp; 0 &lt;= j &amp;&amp; j &lt; COLUMNS);
 22     return elements[i * COLUMNS + j];
 23  }
 24     
 25  MatrixRow Matrix::operator[](int i) 
 26  {
 27     return MatrixRow(this, i);
 28  }   
 29  
 30  ConstMatrixRow Matrix::operator[](int i) const
 31  {
 32     return ConstMatrixRow(this, i);
 33  }   
 34     
 35  MatrixRow::MatrixRow(Matrix* m, int s)
 36  {
 37     mat = m;
 38     i = s;
 39  }   
 40     
 41  double&amp; MatrixRow::operator[](int j)
 42  {
 43     return (*mat)(i,j);
 44  }   
 45  
 46  ConstMatrixRow::ConstMatrixRow(const Matrix* m, int s)
 47  {
 48     mat = m;
 49     i = s;
 50  }   
 51  
 52  double ConstMatrixRow::operator[](int j) const
 53  {
 54     return (*mat)(i, j);
 55  }   
 56  
 57  Matrix&amp; Matrix::operator+=(const Matrix&amp; right)
 58  {
 59     for (int i = 0; i &lt; Matrix::ROWS; i++)
 60        for (int j = 0; j &lt; Matrix::COLUMNS; j++)
 61           (*this)(i, j) += right(i, j);
 62     return *this;
 63  }
 64  
 65  Matrix operator+(const Matrix&amp; left, const Matrix&amp; right)
 66  {
 67     Matrix result = left;
 68     result += right;
 69     return result;
 70  }
 71     
 72  Matrix operator*(const Matrix&amp; left, const Matrix&amp; right)
 73  {
 74     Matrix result;
 75     for (int i = 0; i &lt; Matrix::ROWS; i++)
 76        for (int j = 0; j &lt; Matrix::COLUMNS; j++)
 77           for (int k = 0; k &lt; Matrix::COLUMNS; k++)         
 78              result(i, j) += left(i, k) * right(k, j); 
 79     return result;
 80  }
 81     
 82  Matrix operator*(const Matrix&amp; left, double right)
 83  {
 84     Matrix result;
 85     for (int i = 0; i &lt; Matrix::ROWS; i++)
 86        for (int j = 0; j &lt; Matrix::COLUMNS; j++)
 87           result(i, j) = left(i, j) * right; 
 88     return result;
 89  }
 90     
 91  Matrix operator*(double left, const Matrix&amp; right)
 92  {
 93     return right * left;
 94  }
 95  
 96  ostream&amp; operator&lt;&lt;(ostream&amp; left, const Matrix&amp; right)
 97  {
 98     const int WIDTH = 10;
 99     for (int i = 0; i &lt; Matrix::ROWS; i++)
100     {
101        for (int j = 0; j &lt; Matrix::COLUMNS; j++)
102           left &lt;&lt; setw(WIDTH) &lt;&lt; right(i, j);
103        left &lt;&lt; "\n";
104     }
105     return left;
106  }</pre>
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