pimpl

main.cpp

#include "pimpl.h"

int main() {
  auto x = new pimpl();
  x->the_method();
  delete x;

  return 0;
}

pimpl.cpp

#include <cstdio>

#include "pimpl.h"


namespace {
  class impl {
  public:
    void the_method() {
      std::printf("Hello\n");
    }
  };
}

pimpl::pimpl() 
  : _pimpl(new impl()) {
}

pimpl::~pimpl() {
  delete ((impl*)_pimpl);
}

void pimpl::the_method() {
  // There are ways to make this shorter but left it simplisitc
  ((impl*)_pimpl)->the_method();
}

pimpl.h

#pragma once

class pimpl {
  void * _pimpl;
public:
  pimpl();
  ~pimpl();

  void the_method();
};