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// -*- C++ -*-
//=============================================================================
/**
* @file Argument_T.h
*
* $Id$
*
* @author Ossama Othman
*/
//=============================================================================
#ifndef TAO_ARGUMENT_T_H
#define TAO_ARGUMENT_T_H
#include /**/ "ace/pre.h"
#include "tao/Argument.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
namespace TAO
{
/**
* @class Const_Argument_T
*
* @brief Type-specific base class subclassed by stub and skeleton
* and argument class templates that have a @c const @c
* arg() method.
*
* The purpose of this class is to make it possible to
* polymorphically retrieve an argument from either stub or skeleton
* argument class template. Both the corresponding stub and
* skeleton argument class templates must of course have the same
* template parameter type in order for the polymorphism to work.
* Use of polymorphism in this manner allows us to avoid having to
* convert between client and server side arguments, which can be
* tedious, and ultimately allows the server side thru-POA
* collocated and uncollocated code paths to share the same single
* set of skeleton code.
*
* This abstract base class requires that subclasses define @c const
* @c arg() method for the sake of const-correctness. The template
* parameter @c T corresponds to the type of argument passed to an
* IDL-defined operation according to the C++ mapping. For example,
* given the following IDL:
*
* @code
* typedef sequence<short> ShortSeq;
*
* interface Foo {
* void op (in ShortSeq s);
* };
* @endcode
*
* the @c Const_Argument_T template parameter @c T would be:
*
* @code
* ShortSeq const &
* @endcode
*
* since that would be parameter type for the corresponding C++
* @c Foo::op() function.
*
* @note This class template is generally only suitable for IDL "@c in"
* parameters since they are read-only.
*
* @see Mutable_Argument_T
*/
template <typename T>
class Const_Argument_T : public Argument
{
public:
virtual T arg (void) const = 0;
};
/**
* @class Mutable_Argument_T
*
* @brief Type-specific base class subclassed by stub and skeleton
* and argument class templates that have a non- @c const @c
* arg() method.
*
* This class template serves the same purpose as the
* @c Const_Argument_T class template except that it is suitable for
* argument subclasses corresponding to mutable parameters (e.g. IDL
* "@c inout", "@c out" and return values. It is not meant for use
* with IDL "@c in" parameters.
*
* @see Const_Argument_T
*/
template <typename T>
class Mutable_Argument_T : public Argument
{
public:
virtual T arg (void) = 0;
};
}
#include /**/ "ace/post.h"
#endif /* TAO_ARGUMENT_T_H */
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