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Constructor Errors Between Classes

StMick (26)
I'm building a LinkedList data structure with a nested Node class. The Node class within the LinkedList class looks like this:

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    class Node {
    public:
        
        Node(){
            this->next = nullptr;
            this->prev = nullptr;
        }

        T data;
        Node* next;
        Node* prev;
    };



My main function looks like this:

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#include <iostream>
#include "linked_list.h"

class Animal{
public:
    Animal(std::string str){
        this->name = str;
    }

    std::string getName(){
        return this->name;
    }

private:
    std::string name;
};

int main() {

    LinkedList<Animal>* AList = new LinkedList<Animal>(0);
    
    Animal* a = new Animal("Fluffy");

    AList->add_last(*a);

    return 0;
}


When I run this code, I get the following error:

error: no matching function for call to 'Animal::Animal()'
16 | Node(){
| ^
C:/LinkedListcpp/main.cpp:6:5: note: candidate: 'Animal::Animal(std::string)'
6 | Animal(std::string str){
| ^~~~~~
C:/LinkedListcpp/main.cpp:6:5: note: candidate expects 1 argument, 0 provided

Any ideas what is causing this problem?
Last edited on
Peter87 (11234)
The data member of the Node class is "default-initialized" but Animal does not have a default constructor.
helios (17574)
Perhaps what you meant to do was
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LinkedList<Animal *> AList;
AList.add_last(new Animal("Fluffy"));


This code looks suspiciously Java-ey. If I'm right and you already know Java, you should be careful about trying to import Java patterns into C++. The languages are not as similar as they appear superficially.
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