How can I use a std::valarray to store/manipulate a contiguous 2D array?

by

Off the top of my head:

template <class element_type>
class matrix
{
public:
    matrix(size_t width, size_t height): m_stride(width), m_height(height), m_storage(width*height) {  }

    element_type &operator()(size_t row, size_t column)
    {
        // column major
        return m_storage[std::slice(column, m_height, m_stride)][row];

        // row major
        return m_storage[std::slice(row, m_stride, m_height)][column];
    }

private:
    std::valarray<element_type> m_storage;
    size_t m_stride;
    size_t m_height;
};

std::valarray provides many interesting ways to access elements, via slices, masks, multidimentional slices, or an indirection table. See std::slice_array, std::gslice_array, std::mask_array, and std::indirect_array for more details.

More Related Contents:

  1. How to access 1 element in 2D dynamic array in C++
  2. Calling a pointer function in C++
  3. How do I take values from text file and input into a 2D array? c++
  4. How do I use arrays in C++?
  5. Iterator invalidation rules for C++ containers
  6. How do I declare a 2d array in C++ using new?
  7. How to pass a multidimensional array to a function in C and C++
  8. Writing your own STL Container
  9. Return a 2d array from a function
  10. Deleting elements from std::set while iterating
  11. std::queue iteration
  12. Converting multidimensional arrays to pointers in c++
  13. Returning multidimensional array from function
  14. Forward declare a standard container?
  15. A pointer to 2d array
  16. C++ std::vector vs array in the real world
  17. Statically declared 2-D array C++ as data member of a class [duplicate]
  18. C++ Filehandling: Difference between ios::app and ios::ate?
  19. How to initialize 3D array in C++
  20. How to allocate a 2D array of pointers in C++
  21. How to print 2D Arrays in C++?
  22. GCC linker can’t find standard library?
  23. C++ 2 dimensional array with variable size rows
  24. Why is the STL so heavily based on templates instead of inheritance?
  25. std::lexical_cast – is there such a thing?
  26. Why do we need to tie std::cin and std::cout?
  27. How can I resize a 2D vector of objects given the width and height?
  28. What is the safe way to fill multidimensional array using std::fill?
  29. In C/C++, is char* arrayName[][] a pointer to a pointer to a pointer OR a pointer to a pointer?
  30. How to cast simple pointer to a multidimensional-array of fixed size?

Leave a Comment