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  1. #include <array>
  2. #include <iostream>
  3. #include <iterator>
  4. #include <initializer_list>
  5.  
  6. template <typename T, size_t N>
  7. struct Array
  8. {
  9. private:
  10.     T data[N];
  11. public:
  12.     constexpr Array(std::initializer_list<T> init)
  13.         : data{}
  14.     {  
  15.         if (init.size() > N) {
  16.             throw "overflow";
  17.         }
  18.         using std::begin;
  19.         using std::end;
  20.         auto dst = begin(data);
  21.         for (auto src = begin(init); src != end(init); ++src, ++dst) {
  22.             *dst = *src;
  23.         }
  24.     }
  25.  
  26.     auto begin() const { return std::begin(data); }
  27.     auto end() const { return std::end(data); }
  28. };
  29.  
  30. template <typename T, size_t N>
  31. std::ostream& operator << (std::ostream& output, const Array<T, N>& array)
  32. {
  33.    output << "[";
  34.    for (auto&& element : array)
  35.       output << " " << element;
  36.  
  37.    return output << " ]";
  38. }
  39.  
  40. int main()
  41. {
  42.    static constexpr Array<int, 4> m{-1, -2, -3, -4};
  43.    std::cout << m << std::endl;
  44.    static constexpr Array<Array<int, 2>, 2> n{{0, 1}, {2, 3}};
  45.    std::cout << n << std::endl;
  46. }
  47.  
  48.  
Success #stdin #stdout 0s 4380KB
comments (?)
stdin 
Standard input is empty
stdout 
[ -1 -2 -3 -4 ]
[ [ 0 1 ] [ 2 3 ] ]
https://ideone.com/J3t69X
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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