How do you properly use namespaces in C

Question

I come from a Java background where packages, not namespaces, are utilised.

I'm used to packaging classes that work together to make a full entity and then reusing them from that package afterwards.

However, I am presently working on C++.

In C++, how do you utilise namespaces?

Do you make a single namespace for the entire application, or do you make several namespaces for each key component?

If that's the case, how can you make objects from classes in different namespaces?

Answer 1

Namespaces are packages essentially. They can be used like this:

namespace MyNamespace
{
  class MyClass
  {
  };
}

Then in code:

MyNamespace::MyClass* pClass = new MyNamespace::MyClass();

Or, if you want to always use a specific namespace, you can do this:

using namespace MyNamespace;

MyClass* pClass = new MyClass();