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162 lines
4 KiB
C++
162 lines
4 KiB
C++
/* -*- C++ -*- */
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//=============================================================================
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/**
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* @file Functor_T.h
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*
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* $Id: Functor_T.h 91396 2010-08-19 12:37:24Z johnnyw $
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*
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* Templatized classes for implementing function objects that are
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* used in various places in ACE. There are currently two major
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* categories of function objects in ACE: GOF Command Pattern
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* objects, and STL-style functors for comparison of container
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* elements. The command objects are invoked via an <execute>
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* method, while the STL-style functors are invoked via an
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* <operator()> method.
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*
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*
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* @author Chris Gill <cdgill@cs.wustl.edu>
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* @author Based on Command Pattern implementations originally done by
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* @author Carlos O'Ryan <coryan@cs.wustl.edu>
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* @author Douglas C. Schmidt <schmidt@cs.wustl.edu>
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* @author Sergio Flores-Gaitan <sergio@cs.wustl.edu>
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* @author and on STL-style functor implementations originally done by
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* @author Irfan Pyarali <irfan@cs.wustl.edu>
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*/
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//=============================================================================
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#ifndef ACE_FUNCTOR_T_H
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#define ACE_FUNCTOR_T_H
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#include /**/ "ace/pre.h"
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#include "ace/Functor.h"
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#if !defined (ACE_LACKS_PRAGMA_ONCE)
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# pragma once
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#endif /* ACE_LACKS_PRAGMA_ONCE */
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#include "ace/Functor_String.h"
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ACE_BEGIN_VERSIONED_NAMESPACE_DECL
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///////////////////////////////////
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// GOF Command Pattern Templates //
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///////////////////////////////////
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/**
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* @class ACE_Command_Callback
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*
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* @brief
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* Defines a class template that allows us to invoke a GOF
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* command style callback to an object without knowing anything
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* about the object except its type.
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*
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* This class declares an interface to execute operations,
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* binding a RECEIVER object with an ACTION. The RECEIVER knows
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* how to implement the operation. A class can invoke operations
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* without knowing anything about it, or how it was implemented.
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*/
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template <class RECEIVER, class ACTION>
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class ACE_Command_Callback : public ACE_Command_Base
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{
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public:
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/// Constructor: sets the @c receiver_ of the Command to @a recvr, and the
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/// @c action_ of the Command to @a action.
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ACE_Command_Callback (RECEIVER &recvr, ACTION action);
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/// Virtual destructor.
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virtual ~ACE_Command_Callback (void);
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/// Invokes the method @c action_ from the object @c receiver_.
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virtual int execute (void *arg = 0);
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private:
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/// Object where the method resides.
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RECEIVER &receiver_;
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/// Method that is going to be invoked.
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ACTION action_;
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};
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/////////////////////////////////
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// STL-style Functor Templates //
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/////////////////////////////////
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/**
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* @class ACE_Hash
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*
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* @brief Function object for hashing
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*/
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template <class TYPE>
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class ACE_Hash
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{
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public:
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/// Simply calls t.hash ()
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unsigned long operator () (const TYPE &t) const;
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};
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/**
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* @class ACE_Pointer_Hash
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*
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* @brief
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* Function object for hashing pointers
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*/
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template <class TYPE>
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class ACE_Pointer_Hash
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{
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public:
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/// Simply returns t.
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unsigned long operator () (TYPE t) const;
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};
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/**
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* @class ACE_Equal_To
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*
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* @brief
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* Function object for comparing two objects of
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* the given type for equality.
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*/
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template <class TYPE>
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class ACE_Equal_To
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{
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public:
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/// Simply calls operator==
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bool operator () (const TYPE &lhs,
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const TYPE &rhs) const;
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};
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/**
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* @class ACE_Less_Than
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*
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* @brief
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* Function object for determining whether the first object of
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* the given type is less than the second object of the same
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* type.
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*/
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template <class TYPE>
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class ACE_Less_Than
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{
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public:
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/// Simply calls operator<
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bool operator () (const TYPE &lhs,
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const TYPE &rhs) const;
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};
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ACE_END_VERSIONED_NAMESPACE_DECL
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#if defined (__ACE_INLINE__)
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#include "ace/Functor_T.inl"
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#endif /* __ACE_INLINE__ */
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#if defined (ACE_TEMPLATES_REQUIRE_SOURCE)
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#include "ace/Functor_T.cpp"
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#endif /* ACE_TEMPLATES_REQUIRE_SOURCE */
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#if defined (ACE_TEMPLATES_REQUIRE_PRAGMA)
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#pragma implementation ("Functor_T.cpp")
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#endif /* ACE_TEMPLATES_REQUIRE_PRAGMA */
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#include /**/ "ace/post.h"
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#endif /* ACE_FUNCTOR_T_H */
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