add_static_make.hpp

/***************************************************
*  File add_static_make.h
*  Copyright (C) 2021-6-19 ModernCpp.ir . All Rights Reserved.  *
***************************************************/

#ifndef ADD_STATIC_MAKE_H
#define ADD_STATIC_MAKE_H

#include <memory>

template<class B, class T = std::nullptr_t>
class add_static_make
{
public:
	add_static_make() = default;

	template<class ... Args>
	static std::shared_ptr<B> make(Args... agrs)
	{
		return std::make_shared<
			typename std::conditional<std::is_same<T, std::nullptr_t>::value, B, T>::type>(std::forward<Args>(agrs)...);
	}
};


#endif // ADD_STATIC_MAKE_H

example.cpp

// Example program
#include <iostream>
#include <string>

/***************************************************
*  File empire_command_interface.h
*  Copyright (C) 2021-6-5 ModernCpp.ir . All Rights Reserved.  *
***************************************************/

#ifndef EMPIRE_COMMAND_INTERFACE_H
#define EMPIRE_COMMAND_INTERFACE_H

#include <string>

class empire_command_interface
{
public:
	empire_command_interface(std::string* msg){}

	virtual std::string execute() = 0;

	virtual std::string name() = 0;
};

#endif // EMPIRE_COMMAND_INTERFACE_H


/***************************************************
*  File add_static_make.h
*  Copyright (C) 2021-6-19 ModernCpp.ir . All Rights Reserved.  *
***************************************************/

#ifndef ADD_STATIC_MAKE_H
#define ADD_STATIC_MAKE_H

#include <memory>

template<class B, class T = std::nullptr_t>
class add_static_make
{
public:
	add_static_make() = default;

	template<class ... Args>
	static std::shared_ptr<B> make(Args... agrs)
	{
		return std::make_shared<
			typename std::conditional<std::is_same<T, std::nullptr_t>::value, B, T>::type>(std::forward<Args>(agrs)...);
	}
};


#endif // ADD_STATIC_MAKE_H



/***************************************************
*  File get_kingdom_connections_info_command.h
*  Copyright (C) 2021-6-10 ModernCpp.ir . All Rights Reserved.  *
***************************************************/

#ifndef GET_KINGDOM_CONNECTIONS_INFO_COMMAND_H
#define GET_KINGDOM_CONNECTIONS_INFO_COMMAND_H

#include <memory>

class get_kingdom_connections_info_command
	: public empire_command_interface,
	  public add_static_make<empire_command_interface, get_kingdom_connections_info_command>
{
public:
	get_kingdom_connections_info_command(std::string* msg):empire_command_interface(msg) {}

	// empire_command_interface interface
public:
	std::string execute() override
	{
		return "";
	}
	std::string name() override
	{
		return "get_kingdom_connections_info_command";
	}
};

#endif // GET_KINGDOM_CONNECTIONS_INFO_COMMAND_H

/***************************************************
*  File restrict_gate_command.h
*  Copyright (C) 2021-6-10 ModernCpp.ir . All Rights Reserved.  *
***************************************************/

#ifndef RESTRICT_GATE_COMMAND_H
#define RESTRICT_GATE_COMMAND_H

#include <memory>

class restrict_gate_command
	: public empire_command_interface,
	  public add_static_make<empire_command_interface, restrict_gate_command>
{
public:
	explicit restrict_gate_command(std::string* msg):empire_command_interface(msg) {}

	//	static std::shared_ptr<restrict_gate_command> make();

	// empire_command_interface interface
public:
	std::string execute() override
	{
		return "";
	}
	std::string name() override
	{
		return "restrict_gate_command";
	}
};

#endif // RESTRICT_GATE_COMMAND_H

int main()
{
	std::string msg("test command");
	auto rgc = restrict_gate_command::make(&msg);
	auto gkcic = get_kingdom_connections_info_command::make(&msg);

	std::cout << rgc->name() << std::endl;
	std::cout << gkcic->name() << std::endl;
}