ACE_Command_Callback(3)

ACE_Command_Callback3

Defines a class template that allows us to invoke a gof command style callback to an object without knowing anything about the object except its type.

Usage

#include <ace/Functor_T.h>
template<class RECEIVER, class ACTION>
class ACE_Command_Callback : public ACE_Command_Base
{
  public:
    ACE_Command_Callback (RECEIVER &recvr, ACTION action);
    virtual ~ACE_Command_Callback (void);
    virtual int execute (void *arg = 0);
  private:
    RECEIVER &receiver_;
    ACTION action_;
};

Overview

Templatized classes for implementing function objects that are used in various places in ACE. There are currently two major categories of function objects in ACE: GOF Command Pattern objects, and STL-style functors for comparison of container elements. The command objects are invoked via an execute method, while the STL-style functors are invoked via an operator() method.

Public members

ACE_Command_Callback (RECEIVER &recvr, ACTION action);

Constructor: sets the receiver_ of the Command to recvr, and the action_ of the Command to action.

virtual ~ACE_Command_Callback (void);

Virtual destructor.

virtual int execute (void *arg = 0);

Invokes the method action_ from the object receiver_.

Private members

RECEIVER &receiver_;

Object where the method resides.

ACTION action_;

Method that is going to be invoked.

Library

ace