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  1. #include <iostream>
  2. #include <valarray>
  3.  
  4. template<typename T>
  5. class Matrix {
  6.     std::valarray<T> data;
  7.     size_t columns;
  8.  public:
  9.     Matrix(size_t rows, size_t columns)
  10.     : data(rows*columns), columns(columns) {}
  11.  
  12.     T operator()(size_t row, size_t col) const
  13.     {
  14.         return data[row + columns*col];
  15.     }
  16.  
  17.     T& operator()(size_t row, size_t col)
  18.     {
  19.         return data[row + columns*col];
  20.     }
  21.  
  22.     Matrix& operator+=(const Matrix& other)
  23.     {
  24.         data += other.data;
  25.         return *this;
  26.     }
  27. };
  28.  
  29. template<typename T>
  30. Matrix<T> operator+(Matrix<T> lhs, const Matrix<T>& rhs)
  31. {
  32.     return lhs += rhs;
  33. }
  34.  
  35. int main()
  36. {
  37.     Matrix<int> m1(2,2);
  38.     m1(0,0) = 1; m1(0,1) = 2;
  39.     m1(1,0) = 3; m1(1,1) = 4;
  40.  
  41.     Matrix<int> m2 = m1;
  42.     Matrix<int> m3 = m1 + m2;
  43.  
  44.     std::cout << m3(0,0) << ' ' << m3(0,1) << '\n'
  45.               << m3(1,0) << ' ' << m3(1,1) << '\n';
  46. }
  47.  
Success #stdin #stdout 0.02s 2856KB
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https://ideone.com/ZR6xuV
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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