Convenient way to declare 2D (or even higher dimension) arrays with std::array

by

You can use a type alias template:

#include <array> 
#include <cstddef>

template <class T, std::size_t x, std::size_t y>
using Array2D = std::array<std::array<T, y>, x>;

int main() {
    Array2D<int, 5, 3> arr;
}

You can also generalize it like so for any dimension:

#include <array>
#include <cstddef>

template <class T, std::size_t size, std::size_t... sizes>
struct ArrayHelper {
    using type = std::array<typename ArrayHelper<T, sizes...>::type, size>;
};

template <class T, std::size_t size>
struct ArrayHelper<T, size> {
    using type = std::array<T, size>;
};

template <class T, std::size_t... sizes>
using Array = typename ArrayHelper<T, sizes...>::type;

int main() { 
    Array<int, 5, 3, 4, 3> arr; 
}

Related Contents:

  1. How do I declare a 2d array in C++ using new?
  2. How do I use arrays in C++?
  3. Passing a 2D array to a C++ function
  4. A pointer to 2d array
  5. How to pass a multidimensional array to a function in C and C++
  6. Is there a reason for zero sized std::array in C++11?
  7. How to initialize 3D array in C++
  8. What are the advantages of using std::array over C-style arrays?
  9. How to return a 2D array from a function [duplicate]
  10. Given a 2D array int[][], what does it mean to create a pointer int(*)[]?
  11. How do I find the length of an array?
  12. What is array to pointer decay?
  13. Why aren’t variable-length arrays part of the C++ standard?
  14. Using arrays or std::vectors in C++, what’s the performance gap?
  15. Is std::vector so much slower than plain arrays?
  16. Accessing an array out of bounds gives no error, why?
  17. How to initialize std::vector from C-style array?
  18. Freaky way of allocating two-dimensional array?
  19. NumPy style arrays for C++? [closed]
  20. What is the difference between Static and Dynamic arrays in C++?
  21. Fastest way to zero out a 2d array in C?
  22. Why do C and C++ support memberwise assignment of arrays within structs, but not generally?
  23. How to get the length of row/column of multidimensional array in C#?
  24. more modern way of looping through C++ arrays
  25. Why does std::array not have an constructor that takes a value for the array to be filled with?
  26. C++11: Correct std::array initialization?
  27. c++ array assignment of multiple values
  28. Correct way to work with vector of arrays
  29. Initializing an array of zeroes
  30. Difference between passing array, fixed-sized array and base address of array as a function parameter
  31. Return a 2d array from a function
  32. C++ [] array operator with multiple arguments?
  33. Determine the size of a C++ array programmatically?
  34. C++ Array of pointers: delete or delete []?
  35. Initialize all the elements of an array to the same number
  36. array of vectors or vector of arrays?
  37. Difference between char and char[1]
  38. Cleanest way to copy a constant size array in c++11
  39. Braces around string literal in char array declaration valid? (e.g. char s[] = {“Hello World”})
  40. How to map the indexes of a matrix to a 1-dimensional array (C++)?
  41. How do I return a char array from a function?
  42. What is the memory layout of vector of arrays?
  43. Linear index upper triangular matrix
  44. determine size of array if passed to function
  45. Why do we need to specify the column size when passing a 2D array as a parameter?
  46. How to create an array of thread objects in C++11?
  47. Accessing arrays by index[array] in C and C++
  48. Why does this work? Illogical array access
  49. Initialize an std::array algorithmically at compile time
  50. What is array-to-pointer conversion aka. decay?

Leave a Comment