C++ Scope Operator

scope_operator.cpp

/*
	on os x compile with
	clang++ scope_operator.cpp -o scope_operator

	on windows compile with
	cl /EHsc scope_operator.cpp

	on linux compile with
	g++ scope_operator.cpp -o scope
*/

#include <iostream>

void Buy(std::string thing)
{
	std::cout << "Buying " << thing << std::endl;
}

void Read(std::string thing)
{
	std::cout << "Reading " << thing << std::endl;
}

void Read()
{
	Read("something");
}

namespace Advert
{
	void Read(std::string thing)
	{
		std::cout << "Reading an Advert in ";
		std::cout << thing << std::endl;
	}
}

namespace Book
{
	void Read()
	{
		// call the Read function in the global namespace
		::Read("a Book");
	}
}

namespace Magazine
{
	void Read()
	{
		// call the Read function in the global namespace
		::Read("a Magazine");
		
		// call the Read function in the Advert namespace
		Advert::Read("a Magazine");
		
		// call the Buy function in the global namespace
		Buy("a Magazine");
	}
}

namespace Newspaper
{
	void Read(std::string thing)
	{
		std::cout << "Reading " << thing;
		std::cout << " in the Newspaper";
		std::cout << std::endl;
	}

	void Read()
	{
		// call the Read function in the global namespace
		::Read("a Newspaper");
		
		// call the Read function in the Newspaper namespace
		Read("an article");
		
		// call the Read function in the Advert namespace
		Advert::Read("a Newspaper");
	}
}

int main()
{
	// call the Read function from the global namespace
	Read();
	
	// call the Read function from the Book namespace
	Book::Read();
	
	// call the Read function from the Magazine namespace
	Magazine::Read();
	
	// call the Read function from the Newspaper namespace
	Newspaper::Read();
}