// namespace-main-17-18.cpp		By: Aiman Hanna -  ©1993-2006 Aiman Hanna

// This program illustrates more on namespaces aliases. It is similar to 
// namespace-main-9-10.cpp. In specific the program illustrates the behavior 
// when the alias has the same name as the namespace and when the alias has
// the exact name as another namespace. 	


// Key points:  1) Namespace aliases - redefining a namespace

#include "namespace18.h"
int main()
{
	
	
	// give an alias that is exactly the same as the namespase name 
	namespace region3 = region3;
	
	// rg4 is an alias for region4 
	namespace rg4 = region4;

	// Now redefine region4
	namespace region4 = region3::region31;

	namespace rg32 = region3::region31::region32;
	

	region3::Greeting();

	region3::Calc1 c1(30), c11(45), c12(900);
	c1.setValue(32);

	rg4::Calc2 c2;
	c2.setValue(c1);
	cout << "The value of object \"c2\" has been set to : " << c2.getValue() << endl; 

	// use the global object - set it to the same value as c1

	rg4::dup.setValue(c1);
	cout << "The value of object \"dup\" has been set to : " << rg4::dup.getValue() << endl; 

	region3::dup(c1, c11);
	cout << "The value of object \"c1\" has been set to : " << c1.getValue() << endl; 

	cout << "\n\n==============================================\n";
	region4::message1();
	rg32::message2();

	// rg33 alias was given in namespace18.h
	rg33::message3();
	cout << "==============================================\n";

	// rg4 will still behave as the original region4
	rg4::dup.setValue(c12);
	cout << "The value of object \"dup\" has been set to : " << rg4::dup.getValue() << endl; 

	return 0;
}


// The result of running the program
/*
Hello from region 3.
The value of object "c2" has been set to : 32
The value of object "dup" has been set to : 32
The value of object "c1" has been set to : 45


==============================================
Hello...there...Is that really much better?
==============================================
The value of object "dup" has been set to : 900

*/