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  1. #include <algorithm>
  2. #include <iostream>
  3.  
  4. using namespace std;
  5.  
  6. template <class T, int s>
  7. class myArrayImpl {
  8. public:
  9.     T* data;
  10.     T& operator[](int i){return data[i];}
  11.     const T& operator[](int i) const {return data[i];}
  12.     myArrayImpl(){
  13.         data=new T[s]();
  14.     }
  15.     myArrayImpl(const myArrayImpl & other){
  16.         data=new T[s];
  17.         copy(other.data,other.data+s,data);
  18.     }
  19.     myArrayImpl& operator=(const myArrayImpl& other){
  20.         T* olddata = data;
  21.         data=new T[s];
  22.         copy(other.data,other.data+s,data);
  23.         delete [] olddata;
  24.         return *this;
  25.     }
  26.     ~myArrayImpl(){delete [] data;}
  27. };  
  28.  
  29. template <class T, int s>
  30. class myArray : private myArrayImpl<T,s> {
  31.     typedef myArrayImpl<T,s> Impl;
  32. public:
  33.     using Impl::operator[];
  34.     myArray() : Impl() {}
  35.     typedef T value_type; // !!!
  36.     explicit myArray(const value_type& value) {
  37.        fill(this->data, this->data + s, value);
  38.     }
  39.     void setAll(const value_type& value) {
  40.        fill(this->data, this->data + s, value);
  41.     }
  42. };  
  43.  
  44. template <class T, int s1, int s2>
  45. class myArray<myArray<T,s2>,s1> : private myArrayImpl<myArray<T,s2>,s1> {
  46.     typedef myArrayImpl<myArray<T,s2>,s1> Impl;
  47. public:
  48.     using Impl::operator[];
  49.     myArray() : Impl() {}
  50.     typedef typename myArray<T,s2>::value_type value_type; // !!!
  51.     explicit myArray(const value_type& value) {
  52.        setAll(value);
  53.     }
  54.     void setAll(const value_type& value) {
  55.        for_each(this->data, this->data + s1, [value](myArray<T,s2>& v) { v.setAll(value); });
  56.     }
  57. };  
  58.  
  59. int main() {
  60.   myArray<myArray<myArray<int,7>,8>,9> a(7);
  61.   std::cout << a[0][0][0] << std::endl;
  62.   std::cout << a[8][7][6] << std::endl;
  63. }
Success #stdin #stdout 0s 3016KB
comments (?)
stdin 
Standard input is empty
stdout 
7
7
https://ideone.com/0wdT9D
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

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