Private Constructor and make_shared: Solution: Using Pass-Key-Idiom Pattern URL: http://anthony-arnold.com/2012/04/05/three-fun-cpp-techniques/

Caler.cpp

void TestC()
{
  std::shared_ptr<CC> y = CC::CreateCC(10);
	y->Show();
	getchar();
}

CC.cpp

#include "C.h"

std::shared_ptr<CC> CC::CreateCC(int x)
{
  return std::make_shared<CC>(CC::Key(),x);
}

CC::CC(const Key& rk, int xy)
{
	y = xy;
}

CC::~CC(void)
{
}


void CC::Show()
{
	printf("Value: %d\n", y);
}

CC.h

#pragma once
#include <memory>

class CC
{
public:
  static std::shared_ptr<CC> CreateCC(int value);

	class Key {
	private:
		friend std::shared_ptr<CC> CC::CreateCC(int value);
		Key() {}
	};

	CC(const Key&, int y);
	
	~CC(void);

	void Show();

private:
	int y;
};