How should i overload += operator in a vector template? - c++

Question

I got a template class Atlas that will store objects of Animal class and derived classes of Animal;
here's the code:
#include <iostream>
#include <assert.h>
#include <list>
using namespace std;
class Animal {
protected:
std::string m_name;
Animal (std::string name): m_name {name} {}
public:
virtual std::string regn() const { return "???"; }
virtual ~Animal(){
cout << "Destructor animal"<<'\n';}
};
class Nevertebrate : public Animal{
public:
virtual std::string regn() const { return "nevertebrate";}
virtual ~Nevertebrate();
};
class Vertebrate: public Animal {
protected:
/* std::string m_name;
Vertebrate (std::string name)
:m_name {name} {} */
Vertebrate (std::string name)
: Animal {name} {}
public:
virtual std::string regn() const { return "vertebrate";}
virtual ~Vertebrate(){
cout<<"Destructor vertebrate"<<'\n';};
};
class bird: public Vertebrate {
public:
bird(std::string name)
: Vertebrate{ name }{}
void set_name (std::string nume){
m_name = nume;}
std::string get_name(){
return m_name;}
virtual std::string regn() const {return "pasare";}
virtual ~bird (){
cout << "destructor bird"<<'\n';}
};
template <class T>
class Atlas
{
private:
int m_length{};
T* m_data{};
public:
void SetLength(int j);
Atlas(int length)
{
assert(length > 0);
m_data = new T[length]{};
m_length = length;
}
Atlas(const Atlas&) = delete;
Atlas& operator=(const Atlas&) = delete;
~Atlas()
{
delete[] m_data;
}
void erase()
{
delete[] m_data;
m_data = nullptr;
m_length = 0;
}
T& operator[](int index)
{
assert(index >= 0 && index < m_length);
return m_data[index];
}
int getLength() const;
};
template <class T>
int Atlas<T>::getLength() const
{
return m_length;
}
template <class T>
void Atlas<T>::SetLength(int j){m_length = j;
}
int main()
{
Atlas<Bird> AtlasBird(10);
Bird b;
AtlasBird.SetLength(11);
AtlasBird[10] = b --- it gets a memoryleak from here.
return 0;
}
I want to overload the += operator so that i can insert a new object into my Atlas, (e.g. AtlasAnimal).
I tried with the SetLength function to increase the length, (e.g. AtlasAnimal.SetLength(11)) but when i try to assign AtlasAnimal[10] an object (e.g. Bird b) it drops a memory leak.
I'm sorry if there was a similar question answered, but i couldn't find anything that helps