मैं सी ++ में नक्शा लागू करना चाहता हूं, इसके लिए मैं वेक्टर आकार की जांच नहीं कर सकता और मेरे द्वारा बनाए गए वेक्टर को मान नहीं दे सकता

मैंने दो वर्ग Node और Map बनाए, जब मैं Map Constructor में table_size प्राप्त करने का प्रयास करता हूं और सभी वेक्टर मानों को nullptr के रूप में असाइन करना चाहता हूं तो यह मुझे त्रुटि देता है।

मेरा कोड यहाँ है यह अतिभारित ऑपरेटर द्वारा कोई समस्या नहीं है मैंने इस पर टिप्पणी की, मुझे अभी भी त्रुटि मिलती है

#include <iostream>
#include <vector>

template <class T1,class T2>
class Node {
    public:
        T1 key;
        T2 value;
        Node* next;

    Node(T1 key,T2 value) : key(key) , value(value) , next(nullptr) {};
};

template <class T1,class T2>
class Map {
    private:
        std::vector<Node<T1,T2>*> hash_table[117];
        int table_size;
    public:
        Map() {
            table_size = hash_table.size();
            for(int i=0;i<table_size;i++) {
                hash_table[i] = nullptr;
            }
        }

        // i assumed that T1 is always string
        int stringToHash(T1 key) {
            int num = 0;
            for(int i=0;i<key.length();i++) {
                num += int(key[i]);
            }
            return ( ( num * 1027 ) % table_size );
        }

        void put(T1 key,T2 value) {
            int idx = stringToHash(key);
            Node<T1,T2>* new_node = createNode(key,value);

            if(hash_table[idx] == nullptr)
                hash_table[idx] = new_node;
            else {
                Node<T1,T2>* ptr = hash_table[idx];
                while(ptr->next != nullptr) {
                    ptr = ptr->next;
                }
                ptr->next = new_node;
            }
        }

        T2 operator[] (T1 key) {
            int idx = stringToHash(key);
            Node<T1,T2>* ptr = hash_table[idx];

            T2 value;
            while(ptr != nullptr) {
                if(ptr->key == key) {
                    value = ptr->value;
                }
                ptr = ptr->next;
            }

            return value;
        }

        Node<T1,T2>* createNode(T1 key,T2 value) {
            Node<T1,T2>* new_node = new Node<T1,T2>(key,value);
            return new_node;
        }
};

int main() {

    Map<std::string,std::string> arr;
    return 0;
}

मेरी त्रुटि इस प्रकार है

03_map.cpp: In instantiation of ‘Map<T1, T2>::Map() [with T1 = std::__cxx11::basic_string<char>; T2 = std::__cxx11::basic_string<char>]’:
03_map.cpp:74:34:   required from here
03_map.cpp:21:37: error: request for member ‘size’ in ‘((Map<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> >*)this)->Map<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> >::hash_table’, which is of non-class type ‘std::vector<Node<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> >*, std::allocator<Node<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> >*> > [117]’
   21 |             table_size = hash_table.size();
      |                          ~~~~~~~~~~~^~~~
03_map.cpp:23:31: error: no match for ‘operator=’ (operand types are ‘std::vector<Node<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> >*, std::allocator<Node<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> >*> >’ and ‘std::nullptr_t’)
   23 |                 hash_table[i] = nullptr;
      |                 ~~~~~~~~~~~~~~^~~~~~~~~
In file included from /usr/include/c++/10.2.0/vector:72,
                 from 03_map.cpp:2:
/usr/include/c++/10.2.0/bits/vector.tcc:198:5: note: candidate: ‘std::vector<_Tp, _Alloc>& std::vector<_Tp, _Alloc>::operator=(const std::vector<_Tp, _Alloc>&) [with _Tp = Node<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> >*; _Alloc = std::allocator<Node<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> >*>]’
  198 |     vector<_Tp, _Alloc>::
      |     ^~~~~~~~~~~~~~~~~~~
/usr/include/c++/10.2.0/bits/vector.tcc:199:42: note:   no known conversion for argument 1 from ‘std::nullptr_t’ to ‘const std::vector<Node<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> >*, std::allocator<Node<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> >*> >&’
  199 |     operator=(const vector<_Tp, _Alloc>& __x)
      |               ~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~
In file included from /usr/include/c++/10.2.0/vector:67,
                 from 03_map.cpp:2:
/usr/include/c++/10.2.0/bits/stl_vector.h:709:7: note: candidate: ‘std::vector<_Tp, _Alloc>& std::vector<_Tp, _Alloc>::operator=(std::vector<_Tp, _Alloc>&&) [with _Tp = Node<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> >*; _Alloc = std::allocator<Node<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> >*>]’
  709 |       operator=(vector&& __x) noexcept(_Alloc_traits::_S_nothrow_move())
      |       ^~~~~~~~
/usr/include/c++/10.2.0/bits/stl_vector.h:709:26: note:   no known conversion for argument 1 from ‘std::nullptr_t’ to ‘std::vector<Node<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> >*, std::allocator<Node<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> >*> >&&’
  709 |       operator=(vector&& __x) noexcept(_Alloc_traits::_S_nothrow_move())
      |                 ~~~~~~~~~^~~
/usr/include/c++/10.2.0/bits/stl_vector.h:730:7: note: candidate: ‘std::vector<_Tp, _Alloc>& std::vector<_Tp, _Alloc>::operator=(std::initializer_list<_Tp>) [with _Tp = Node<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> >*; _Alloc = std::allocator<Node<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> >*>]’
  730 |       operator=(initializer_list<value_type> __l)
      |       ^~~~~~~~
/usr/include/c++/10.2.0/bits/stl_vector.h:730:46: note:   no known conversion for argument 1 from ‘std::nullptr_t’ to ‘std::initializer_list<Node<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> >*>’
  730 |       operator=(initializer_list<value_type> __l)
      |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~

क्या आप मुझे बता सकते हैं कि मैंने क्या गलत किया?