Cpp namespaces

namespaces are just what they sound like. A named container for variables, functions, etc.

Declare namespace

namespace cars{

	int a = 0;
	int b = 0;
	
	void myfunc(){
		return 0;
	}
}

namespace trucks{

	int a = 1;
	int b = 1;

	void myfunc(){
		return 1;
	}
}

Accessing namespace

// access namespace
cout << cars::a;		// print a from namespace 'cars'
cout << trucks::a;	// print b from namespace 'trucks'


// import namespace into local namespace
using namespace trucks

cout << a;			// print a from namespace 'trucks'
cout << cars::a;	// print a from namespace 'cars'

std namespace

the std namespace contains the majority of the builtin variables, function, class types. Pretty much all cpp functions will likely import it into the local namespace.