Import

How to import Class defintions in your source file.

In java a single statement can 'import' a class or a package:


import acdk.util.*; // import all classes from acdk.util
import acdk.net.ServerSocket; // import single class
class Dummy 
{
  static void foo()
  {
    ServerSocket server = new ServerSocket(1234);
  }
}

If you use the class with explicit namespace you even doesn't need the import statement in Java.


class Dummy 
{
  static void foo()
  {
    java.net.ServerSocket server = new java.net.ServerSocket(1234);
  }
}

In C++ it is not so simple. You have to include the correct headers, to use the namespace and to link the needed libraries.

In acdk you use:


#include <acdk.h>
#include <acdk/net/SocketServer.h>

to include the headers for the declaration of classes.
You can refer to the classes with their full qualified class name:


acdk::net::RServerSocket server = new acdk::io::ServerSocket(1234);

You can can 'import' the complete namespace:


using namespace acdk::net;

to refer to classes in package/namespace acdk::net with their short form, often not recommented. But you can use the macro USING_CLASS



USING_CLASS(::acdk::net::, ServerSocket);
// this 'uses' ::acdk::net::ServerSocket, ::acdk::net::RServerSocket,
//             ::acdk::net::ServerSocketArray and ::acdk::net::RServerSocketArray

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