Constructor and destructor in c++ when using the pimpl idiom

I come from Java that has a different way in handling what's private and has to be hided regarding a class implementation and it also has a garbage collector which means there is no need for a destructor.

I learned the basics of how to implement a class in c++ but I need to better understand how to implement a class, in particular the constructor and destructor, when using the pimpl idiom.

hpp file:

class MyClass{
public:
  MyClass();
  MyClass(std::vector<int>& arr);
  ~MyClass();

 
private:
  struct Impl;
  Impl* pimpl;
};

cpp file:

#include "MyClass.hpp"
using namespace std;


struct MyClass::Impl{
  vector<int> arr;
  int var;
};

I wrote the sample code of a class using the pimpl idiom and I'm looking for an answer to these questions:

• How do I implement the constructor to create an empty instance of MyClass?

MyClass::MyClass(){}

• How do I implement the constructor to create an instance of MyClass with these arguments?

MyClass::MyClass(vector<int>& arr,int var){}

• How do I implement the destructor?

MyClass::~MyClass(){}

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