/* Metaprogramming type templates initializer_list Data structure The Array Class (better than stl) by Paul Caron 2020 */ #include #include #include #include //only used for comparison demo using namespace std; template class Array{ public: T arr[Size]; class iterator{ public: Array* parent; using difference_type = ptrdiff_t; using value_type = T; using pointer = T*; using reference = T&; using iterator_category = random_access_iterator_tag; size_t pos; iterator(Array*p):parent{p},pos{0}{} iterator(Array*p,size_t i):parent{p},pos{i}{} iterator operator+(size_t i){ if(i+posarr+pos); cerr<<"Index out range "; exit(1); } iterator& operator++(){ pos++; return *this; } iterator operator++(int){ iterator temp(*this); operator++(); return temp; } iterator& operator--(){ pos--; return *this; } iterator operator--(int){ iterator temp(*this); operator--(); return temp; } bool operator!=(iterator other){ return pos!=other.pos; } bool operator==(iterator other){ return pos==other.pos; } bool operator<(iterator other){ return pos(iterator other){ return pos>other.pos; } bool operator>=(iterator other){ return pos>=other.pos; } }; Array(){}; template Array(iterator i, iterator j){ if(size_t(distance(i,j))<=Size) copy(i,j,arr); } Array(initializer_listlst){ if(lst.size()<=Size) copy(lst.begin(),lst.end(),arr); } iterator begin(){return iterator(this);} iterator end(){return iterator(this, Size);} T& operator[](size_t index){ if(index>=Size){ cerr<<"Index out range "; exit(1); } return arr[index]; } iterator operator+(size_t index){ if(index>=Size){ cerr<<"Index out range "; exit(1); } return iterator(this,index); } T& operator*(){ return arr[0]; } }; int main() { cout<<"1d array of integers"<a{1,2,3,4}; for(auto i:a) cout<b{'a','b','c','d','e'}; for(auto c:b) cout<c{s.begin(),s.end()}; for(auto d:c) cout<,2> arr={ {1,2,3,4}, {5,6,7,8} }; for(auto i:arr){ for(auto j:i) cout<,2>,2> arr3={ {{1,2},{3,4}}, {{5,6},{7,8}} }; for(auto i:arr3){ for(auto j:i){ cout<<"{ "; for(auto k:j) cout<,2> arr2{{ {1,2,3,4}, {5,6,7,8} }};//notice the annoying extra curly brackets. for(auto i:arr2){ for(auto j:i) cout<

Array Class - Data structure Iterator Initializer list ...