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  1. #include <cstddef>
  2. #include <iostream>
  3. #include <iterator>
  4. #include <algorithm>
  5.  
  6. template<typename T>
  7. class my_array{
  8.     T* data_;
  9.     std::size_t size_;
  10.  
  11. public:
  12.  
  13.     my_array()
  14.         : data_(NULL), size_(0)
  15.     {}
  16.     my_array(std::size_t size)
  17.         : data_(new T[size]), size_(size)
  18.     {}
  19.     my_array(const my_array<T>& other){
  20.         size_ = other.size_;
  21.         data_ = new T[size_];
  22.         for (std::size_t i = 0; i<size_; i++)
  23.             data_[i] = other.data_[i];
  24.     }
  25.     my_array(const T* first, const T* last){
  26.         size_ = last - first;
  27.         data_ = new T[size_];
  28.  
  29.         for (std::size_t i = 0; i<size_; i++)
  30.             data_[i] = first[i];
  31.     }
  32.  
  33.     ~my_array(){
  34.         delete [] data_;
  35.     }
  36.     const my_array<T>& operator=(const my_array<T>& other){
  37.         size_ = other.size_;
  38.         data_ = new T[size_];
  39.         for (std::size_t i = 0; i<size_; i++)
  40.             data_[i] = other.data_[i];
  41.         return other;
  42.     }
  43.     const T& operator[](std::size_t idx) const {return data_[idx];}
  44.     T& operator[](std::size_t& idx) {return data_[idx];}
  45.     std::size_t size(){return size_;}
  46.  
  47.     T* begin(){return data_;}
  48.     T* end(){return data_+size_;}
  49. };
  50.  
  51. template<typename T>
  52. void print(T t) {
  53.     std::cout << t << std::endl;
  54. }
  55.  
  56. int main(){
  57.  
  58.  
  59.     typedef float scalar_t;
  60.     scalar_t list [] = {1, 3, 5, 2, 4, 3, 5, 10, 10};
  61.     my_array<scalar_t> a(list, list+sizeof(list)/sizeof(scalar_t));
  62.  
  63.     // works!
  64.     for (scalar_t* it = a.begin(), *end = a.end();
  65.          it != end; ++it)
  66.         std::cout << ' ' << *it;
  67.     std::cout << std::endl;
  68.  
  69.     // works!
  70.     std::for_each(a.begin(), a.end(), print<scalar_t>);
  71.     std::cout << std::endl;
  72.  
  73.     // works!
  74.     my_array<int> b(a.size());
  75.     std::copy(a.begin(), a.end(), b.begin());
  76.  
  77.     // works!
  78.     scalar_t* end = std::remove(a.begin(), a.end(), 5);
  79.     std::for_each(a.begin(), end, print<scalar_t>);
  80.     std::cout << std::endl;
  81.  
  82.     // works!
  83.     std::random_shuffle(a.begin(), end);
  84.     std::for_each(a.begin(), end, print<scalar_t>);
  85.     std::cout << std::endl;
  86.  
  87.     // works!
  88.     std::cout << "Counts of 3 in array = " << std::count(a.begin(), end, 3) << std::endl << std::endl;
  89.  
  90.     // works!
  91.     std::sort(a.begin(), end);
  92.     std::for_each(a.begin(), end, print<scalar_t>);
  93.     std::cout << std::endl;
  94.  
  95.     // works!
  96.     if (!std::binary_search(a.begin(), a.end(), 5))
  97.         std::cout << "Removed!" << std::endl;
  98.  
  99.     return 0;
  100. }
  101.  
Success #stdin #stdout 0s 2988KB
comments (?)
stdin
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Standard input is empty
stdout
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 1 3 5 2 4 3 5 10 10
1
3
5
2
4
3
5
10
10

1
3
2
4
3
10
10

3
4
3
10
1
10
2

Counts of 3 in array = 2

1
2
3
3
4
10
10

Removed!
https://ideone.com/AEVnn0
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
public

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