Shared resources in C++0x

gistfile1.c++

#include <iostream>
#include <string>
#include <memory>

struct Printer {
	virtual void Print() = 0;
};

struct StandardCoutPrinter : Printer {
	std::weak_ptr<std::string> content;
	StandardCoutPrinter(std::shared_ptr<std::string> text) { this->content = std::weak_ptr<std::string>(text); }
	virtual void Print() {
		std::cout << *this->content.lock() << std::endl;
	}
};

int main() {
	// Shared string resource
	std::shared_ptr<std::string> text_res(new std::string("Test"));

	// Initialize printer class with a std::weak_ptr reference
	// which tracks shared resource for changes in content
	std::unique_ptr<StandardCoutPrinter> printer(new StandardCoutPrinter(text_res));

	// Use unmodified string resource
	printer->Print();

	/// Change resource
	// Assign new resource
	*text_res = std::string("Test8");

	printer->Print();

	return 0;
}