strategy.cpp

/**
 * \file
 * \brief
 *
 * \todo
 */

/*
Strategy is an algorithm that you pass into a function or class that uses the strategy.
The idea is that you can provide a different strategy to achieve something different.
*/


#include <iostream>
#include <string>

//-------------------------------------------------------------------------------------------------
class IStrategy
{
public:
	virtual ~IStrategy() { }
	virtual std::string format(const std::string &, const std::string &) const = 0;
};
//-------------------------------------------------------------------------------------------------
class Formatter : public IStrategy
{
public:
	std::string format(const std::string & s1, const std::string & s2) const
	{
		return s1 + " " + s2 + "!";
	}
};
//-------------------------------------------------------------------------------------------------
void hello_world(const IStrategy & strategy)
{
	std::cout << strategy.format("Hello", "world") << std::endl;
}
//-------------------------------------------------------------------------------------------------
int main()
{
	hello_world( Formatter() );
	return 0;
}
//-------------------------------------------------------------------------------------------------