CODEWITHSUNDEEP
c++templatestype-conversion
balzex
balzex

Reputation: 25

error C2664 :cannot convert argument from 'Node<int>* ' to 'int'

Node.h:

#include <memory>
using namespace std;

template <typename T>
class Node
{
  private:
     T m_Data;
     shared_ptr<Node<T>> pre_node,next_node;

  public:
     Node(T iData, Node* pre_ptr = nullptr, Node* next_ptr = nullptr) 
       :m_Data(iData),pre_node(make_shared<Node>(pre_ptr)),
        next_node(make_shared<Node>(next_ptr))
};

main.cpp

#include "Node.h"

int main()
{
   Node<int> head(1);

   system("pause");

   return 0;
}

I get an error when try to run the code:

 error C2664: 'Node<int>::Node(const Node<int> &) throw()' : cannot convert argument 1   
 from 'Node<int> *' to 'int'

Can someone explain the problem and the way to correct it?

Upvotes: 0

Views: 2353

Answers (1)

juanchopanza
juanchopanza

Reputation: 227370

The problem is most likely the call to std::make_shared:

make_shared<Node>(next_ptr)

Here, the argument should be a Node or something that can be used to construct one (for instance, a T or specifically in your case, an int.) You are passing a Node*.

Don't pass a Node*. Pass an int or a Node. Or change your constructor to something like this:

 Node(T iData, shared_ptr<Node> pre_ptr = nullptr, shared_pre<Node> next_ptr = nullptr) 
   : m_Data(iData),
     pre_node(pre_ptr),
     next_node(next_ptr)

Upvotes: 2

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