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/* -*- C++ -*- */
// $Id$
// ============================================================================
//
// = LIBRARY
// ace
//
// = FILENAME
// Functor_T.h
//
// = DESCRIPTION
// 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.
//
// = AUTHOR
// Chris Gill <cdgill@cs.wustl.edu>
//
// Based on Command Pattern implementations originally done by
//
// Carlos O'Ryan <coryan@cs.wustl.edu>,
// Douglas C. Schmidt <schmidt@cs.wustl.edu>, and
// Sergio Flores-Gaitan <sergio@cs.wustl.edu>
//
// and on STL-style functor implementations originally done by
//
// Irfan Pyarali <irfan@cs.wustl.edu>
//
// ============================================================================
#ifndef ACE_FUNCTOR_T_H
#define ACE_FUNCTOR_T_H
#include "ace/pre.h"
#include "ace/Functor.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
///////////////////////////////////
// GOF Command Pattern Templates //
///////////////////////////////////
template <class RECEIVER, class ACTION>
class ACE_Command_Callback : public ACE_Command_Base
{
// = TITLE
// 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.
//
// = DESCRIPTION
// This class declares an interface to execute operations,
// binding a RECEIVER object with an ACTION. The RECEIVER knows
// how to implement the operation. A class can invoke operations
// without knowing anything about it, or how it was implemented.
public:
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:
RECEIVER &receiver_;
// Object where the method resides.
ACTION action_;
// Method that is going to be invoked.
};
/////////////////////////////////
// STL-style Functor Templates //
/////////////////////////////////
template <class TYPE>
class ACE_Hash
{
// = TITLE
// Function object for hashing
public:
u_long operator () (const TYPE &t) const;
// Simply calls t.hash ()
};
template <class TYPE>
class ACE_Pointer_Hash
{
// = TITLE
// Function object for hashing pointers
public:
u_long operator () (TYPE t) const;
// Simply returns t.
};
template <class TYPE>
class ACE_Equal_To
{
// = TITLE
// Function object for comparing two objects of
// the given type for equality.
public:
int operator () (const TYPE &lhs,
const TYPE &rhs) const;
// Simply calls operator==
};
template <class TYPE>
class ACE_Less_Than
{
// = TITLE
// Function object for determining whether the first object of
// the given type is less than the second object of the same
// type.
public:
int operator () (const TYPE &lhs,
const TYPE &rhs) const;
// Simply calls operator<
};
#if defined (__ACE_INLINE__)
#include "ace/Functor_T.i"
#endif /* __ACE_INLINE__ */
#if defined (ACE_TEMPLATES_REQUIRE_SOURCE)
#include "ace/Functor_T.cpp"
#endif /* ACE_TEMPLATES_REQUIRE_SOURCE */
#if defined (ACE_TEMPLATES_REQUIRE_PRAGMA)
#pragma implementation ("Functor_T.cpp")
#endif /* ACE_TEMPLATES_REQUIRE_PRAGMA */
#include "ace/post.h"
#endif /* ACE_FUNCTOR_T_H */
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